博士（理学）, 九州大学

Hyper Material

結晶成長

金属物性

解析・評価

結晶工学

準結晶

スピングラス

希土類合金

近似結晶

クラスター

秩序と乱れ

X線回折

中性子回折

自己相似構造

Natural Science, Magnetism, superconductivity and strongly correlated systems

Nanotechnology/Materials, Crystal engineering

Nanotechnology/Materials, Applied physical properties

Bachelor's degree program, School of Engineering

Master's degree program, Graduate School of Engineering

Doctoral (PhD) degree program, Graduate School of Engineering

Oct. 2001, The Crystallographic Society of Japan, The Young Crystallographer Award of The Crystallographic Society of Japan
Structure Analysis of Quasicrystals by Density Modification Method
Hiroyuki Takakura

1998, The Japan Institute of Metals and Materials, The Japan Institute of Metals and Materials Metallography Award
Hiroyuki Takakura

Monte Carlo Studies of Ferromagnetic Transition in Classical Heisenberg Model on Icosahedral Quasicrystal
Shinji Watanabe; Tsunetomo Yamada; Hiroyuki Takakura; Nobuhisa Fujita
MATERIALS TRANSACTIONS, 67, 5, 609, 620, Japan Institute of Metals, 01 May 2026, [Peer-reviewed]
Scientific journal, 44584968

Monte Carlo study on critical exponents of the classical Heisenberg model in ferromagnetic icosahedral quasicrystal
Shinji Watanabe; Tsunetomo Yamada; Hiroyuki Takakura; Nobuhisa Fujita
Physical Review Research, 7, 4, 043113, American Physical Society (APS), 28 Oct. 2025, [Peer-reviewed]
English, Scientific journal, Quasicrystals (QCs) lack three-dimensional periodicity of atomic arrangement but possess long-range structural order, which are distinct from periodic crystals and random systems. Here, we show how the ferromagnetic (FM) order arises in the icosahedral QC (i-QC) on the basis of the Monte Carlo simulation of the Heisenberg model on the Yb lattice of Cd 5.7 Yb composed of regular icosahedrons. By finite-size scaling of the Monte Carlo data, we identified the critical exponents of the magnetization, magnetic susceptibility, and spin correlation length, β = 0.508 ( 30 ) ,   γ = 1.361 ( 59 ) , and ν = 0.792 ( 17 ) , respectively. We confirmed that our data satisfy the hyperscaling relation and estimated the other critical exponents α = − 0.376 ( 51 ) ,   δ = 3.68 ( 23 ) , and η = 0.282 ( 65 ) . These results show a universality class inherent in the i-QC, which is different from those in periodic magnets and spin glasses. In the i-QC, each Yb site at vertices of the regular icosahedrons is classified into eight classes with respect to the coordination numbers of the nearest-neighbor and next-nearest-neighbor bonds. We revealed the FM-transition mechanism by showing that the difference in the local environment of each site is governed by cooperative evolution of spin correlations upon cooling, giving rise to the critical phenomena.

Derivation of a Nonstoichiometric 1/1 Quasicrystal Approximant from a Stoichiometric 2/1 Quasicrystal Approximant and Maximization of the Magnetocaloric Effect
Farid Labib; Hiroyuki Takakura; Asuka Ishikawa; Takenori Fujii; Ryuji Tamura
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 147, 37, 33424, 33431, 17 Sep. 2025, [Peer-reviewed]
English, Scientific journal, 44584968

High-resolution synchrotron X-ray study of icosahedrite, an icosahedral AlCuFe quasicrystal from the Khatyrka meteorite
H. Takakura; K. Mizunuma; T. Yamada; A. Bosak; F. Formisano; L. Paolasini; M. de Boissieu; P. J. Steinhardt; L. Bindi
IUCrJ, 12, 4, International Union of Crystallography (IUCr), 23 May 2025, [Peer-reviewed], [Lead author]
English, Scientific journal, Icosahedrite, natural icosahedral Al₆₃Cu₂₄Fe₁₃, was discovered in a meteorite about 15 years ago. We have carried out a high-resolution X-ray diffraction study on a sample of this meteoritic mineral at the ESRF. The diffraction pattern turned out to be identical to an intermediate phase observed in synthetic i-AlCuFe during the transformation from the quasicrystalline state to a periodic rhombohedral phase. This particular natural Al₆₃Cu₂₄Fe₁₃ grain is an icosahedral quasicrystal on which a modulation by six cosine waves propagating along the fivefold axes is superimposed, with a wavelength of about 20 nm and a polarization in the phason/perpendicular space. By examining the thermodynamic conditions for producing this modulated icosahedral phase at high pressure in the laboratory, we may gain insights into the formation process of the Khatyrka meteorite., 44581838;44584968

Identification of two distinct antiferromagnetic phases in the Au-Al-Gd quasicrystal approximant
Farid Labib; Takanori Sugimoto; Hiroyuki Takakura; Asuka Ishikawa; Ryuji Tamura
PHYSICAL REVIEW B, 111, 17, 01 May 2025
English, Scientific journal

Highly tuneable icosahedral orders in complex Al-Pd-W-Fe alloys
Makito Aoyama; Satoshi Ohhashi; Hiroyuki Takakura; Yutaka Iwasaki; Nobuhisa Fujita
Journal of Alloys and Compounds, 1016, 178838, 178838, Elsevier BV, Feb. 2025, [Peer-reviewed]
English, Scientific journal, 44584968

Structure of face-centred icosahedral quasicrystals with cluster close packing
Tsunetomo Yamada; Hiroyuki Takakura; Akiji Yamamoto
Acta Crystallographica Section A Foundations and Advances, 80, 6, International Union of Crystallography (IUCr), 30 Sep. 2024, [Peer-reviewed]
English, Scientific journal, A 6D structure model for face-centred icosahedral quasicrystals consisting of so-called pseudo-Mackay and mini-Bergman-type atomic clusters is proposed based on the structure model of the Al_69.1Pd₂₂Cr_2.1Fe_6.8 3/2 cubic approximant crystal (with space group Pa 3, a = 40.5 Å) [Fujita et al. (2013). Acta Cryst. A69, 322–340]. The cluster centres form an icosahedral close sphere packing generated by the occupation domains similar to those in the model proposed by Katz & Gratias [J. Non-Cryst. Solids (1993), 153–154, 187–195], but their size is smaller by a factor τ² [τ = (1 + (5)^1/2)/2]. The clusters cover approximately 99.46% of the atomic structure, and the cluster arrangement exhibits 15 and 19 different local configurations, respectively, for the pseudo-Mackay and mini-Bergman-type clusters. The occupation domains that generate cluster shells are modelled and discussed in terms of structural disorder and local reorganization of the cluster arrangements (phason flip).

Phase Equilibria in Aluminium–Ruthenium–Silicon System near 1200 Kelvin
Koichi Kitahara; Hiroyuki Takakura; Yutaka Iwasaki; Kaoru Kimura
MATERIALS TRANSACTIONS, 65, 1, 18, 26, Japan Institute of Metals, 01 Jan. 2024, [Peer-reviewed]
Scientific journal

Crystal structures of five compounds in the aluminium–ruthenium–silicon system
Koichi Kitahara; Hiroyuki Takakura; Yutaka Iwasaki; Kaoru Kimura
Acta Crystallographica Section E Crystallographic Communications, 79, 10, 946, 951, International Union of Crystallography (IUCr), 29 Sep. 2023, [Peer-reviewed]
Scientific journal, Single crystals of five compounds with approximate compositions ∼Ru₁₆(Al_0.78Si_0.22)₄₇, (I), ∼Ru₉(Al_0.70Si_0.30)₃₂, (II), ∼Ru₁₀(Al_0.67Si_0.33)₄₁, (III), ∼Ru(Al_0.57Si_0.43)₅, (IV), and ∼Ru₂(Al_0.46Si_0.54)₉, (V), were obtained from polycrystalline lumps mainly composed of the target compounds, and their crystal structures were determined by means of single-crystal X-ray diffraction. The crystal structure of (I) can be related to that of a cubic rational crystalline approximant to an icosahedral quasicrystal through crystallographic shear and then unit-cell twinning. The crystal structure of (II) is isotypic with that of a phase with composition ∼Fe₉(Al,Si)₃₂. The crystal structure of (III) is comprised of edge-sharing Ru(Al,Si)_9–11 polyhedra with disordered chains along edges of polyhedra. The crystal structure of (IV) is of the LiIrSn₄ type. The crystal structure of (V) can be viewed as a crystallographic shear structure derived from that of (IV).

Formation and structure of 1/1 cubic approximants in the Cd-Mg-Ce system: The identification of a new structural variant
Farid Labib; Nobuhisa Fujita; Hiroyuki Takakura; Satoshi Ohhashi; Takayuki Shiino; An-Pang Tsai; Ryuji Tamura
Journal of Alloys and Compounds, 954, 170151, 170151, Elsevier BV, Sep. 2023, [Peer-reviewed]
Scientific journal

Magnetic properties of the quasicrystal approximant Au65Ga21Tb14
Kazuhiro Nawa; Maxim Avdeev; Asuka Ishikawa; Hiroyuki Takakura; Chin-Wei Wang; Daisuke Okuyama; Ryo Murasaki; Ryuji Tamura; Taku J. Sato
Physical Review Materials, 7, 5, American Physical Society (APS), 31 May 2023, [Peer-reviewed]
Scientific journal

Atomic structure of the unique antiferromagnetic 2/1 quasicrystal approximant
Farid Labib; Hiroyuki Takakura; Asuka Ishikawa; Ryuji Tamura
Physical Review B, 107, 18, American Physical Society (APS), 15 May 2023, [Peer-reviewed]
English, Scientific journal

Preface
Hiroyuki Takakura; Ryuji Tamura
Journal of Physics: Conference Series, 2461, 1, 011001, 011001, IOP Publishing, 01 Mar. 2023
English, Scientific journal, Aperiodic 2022, the 10th International Conference on Aperiodic Crystals, was held as a hybrid type conference on June 20-24, 2022, in Akira Suzuki Hall of Sapporo campus at Hokkaido University, Japan. Aperiodic 2022 is the latest in a series of conferences supported by the Commission on Aperiodic Crystals (CAC) of the International Union of Crystallography (IUCr). These conferences were held essentially every three years, with the most recent meetings in Ames Iowa (the USA, 2018), Prague (Czech Republic, 2015), Cairns (Australia, 2012), Liverpool (UK, 2009), Zao (Japan, 2006), Belo Horizonte (Brazil, 2003) and Nijmegen (The Netherlands, 2000). Aperiodic 2022 was the second of this series held in Japan. The Aperiodic conference series is itself the successor to a series of Conferences on Modulated Structures, Polytypes and Quasicrystals (MOSPOQ), which were held in Marseilles (France, 1984), Wroclaw (Poland, 1986), Varanasi (India, 1988) and Balatonszeplak (Hungary, 1991). This time, Aperiodic 2022 was held under the auspices of Hypermaterials project, running in Japan since 2019 for 5 years, that includes studies of quasicrystals, approximants and incommensurate structures (https://www.rs.tus.ac.jp/hypermaterials/en/index.html).

Although under difficult circumstances, with the COVID19 pandemic was not yet fully contained, Aperiodic 2022 attracted 114 participants from 16 countries (37 onsite and 77 online). A particular feature of the Aperiodic Conference series is its interdisciplinary character. The range of disciplines of participants included mathematics, physics, crystallography and materials science.

The program, which ran from Monday morning until Friday afternoon, was scheduled by considering the time difference between Japan and Europe. It comprised 14 invited and 36 contributed talks, and 36 posters (10 onsite). The Student Award for Outstanding Oral Presentation at the 10th International Conference on Aperiodic Crystals was given to Chiara Moretti (ENS de Lyon, France) for her presentation Self-assembly of nanoparticles: from periodic superlattices to quasicrystal phase. The prize came with a cash prize of 30,000 JPY with honorable certificate.

It was not possible to organize Aperiodic 2022 without help and support of many people. We would like to express our sincere thanks to all the member of Local Organizing Committee, Program Committee, Commission on Aperiodic Crystals of IUCr and Hypermaterials Project, we would also like to extend our special thanks to the reviewers for their help in the paper view process. Last but not least, we would like to thank all the participants, onsite or online, for their beautiful presentations and exciting discussions. Aperiodic 2022 was supported by JSPS KAKENHI Grant Number JP19H05817.

Hiroyuki Takakura and Ryuji Tamura

List of Organizing Committees are available in this Pdf.

Competition between spin-glass and antiferromagnetic states in Tsai-type 1/1 and 2/1 quasicrystal approximants
Farid Labib; Hiroyuki Takakura; Asuka Ishikawa; Ryuji Tamura
Physical Review Materials, 6, 12, 124412-1, 124412-12, American Physical Society (APS), 27 Dec. 2022, [Peer-reviewed]
English, Scientific journal

Precipitation of stable icosahedral quasicrystal phase in a Mg-Zn-Al alloy
Alok Singh; Takanobu Hiroto; Machiko Ode; Hiroyuki Takakura; Karel Tesař; Hidetoshi Somekawa; Toru Hara
Acta Materialia, 225, 117563, 117563, Elsevier BV, Feb. 2022, [Peer-reviewed]
English, Scientific journal, 44584968

The Local Structure of the Fibonacci Chain and the Penrose Tiling from X-Ray Fluorescence Holography
Jens R. Stellhorn; Hiroyuki Takakura; Shinya Hosokawa; Kouichi Hayashi
MATERIALS TRANSACTIONS, 62, 3, 342, 349, Japan Institute of Metals, 01 Mar. 2021, [Peer-reviewed]
Scientific journal

Special issue on materials science on hypermaterials
Ryuji Tamura; Hiroyuki Takakura; Kazuhiko Deguchi; Ryo Yoshida; Kaoru Kimura
Materials Transactions, 62, 3, 297, Japan Institute of Metals (JIM), 01 Mar. 2021
English, Scientific journal

Growth and characterisation of single grain Al-Cu-Ru icosahedral quasicrystals from self-fluxes
Kotoba Toyonaga; Ryosei Shibata; Tsunetomo Yamada; Marc de Boissieu; Olivier Peréz; Pierre Fertey; Hiroyuki Takakura
Philosophical Magazine, 100, 17, 2220, 2243, Informa UK Limited, 01 Sep. 2020, [Peer-reviewed], [Corresponding author]
Scientific journal

The structure solution of the F-type i-ZnMgHf from the X-ray diffraction
Ireneusz Buganski; Kotoba Toyonaga; Hiroyuki Takakura; Tsunetomo Yamada; Marc de Boissieu; Olivier Perez; Pierre Fertey; Janusz Wolny
Materials Science and Technology, 36, 9, 989, 995, Informa UK Limited, 12 Jun. 2020, [Peer-reviewed]
English, Scientific journal

The atomic structure of the Bergman-type icosahedral quasicrystal based on the Ammann–Kramer–Neri tiling
Ireneusz Buganski; Janusz Wolny; Hiroyuki Takakura
Acta Crystallographica Section A Foundations and Advances, 76, 2, 180, 196, International Union of Crystallography (IUCr), 11 Feb. 2020, [Peer-reviewed], [Last author]
Scientific journal, In this study, the atomic structure of the ternary icosahedral ZnMgTm quasicrystal (QC) is investigated by means of single-crystal X-ray diffraction. The structure is found to be a member of the Bergman QC family, frequently found in Zn–Mg–rare-earth systems. Theab initiostructure solution was obtained by the use of theSuperflipsoftware. The infinite structure model was founded on the atomic decoration of two golden rhombohedra, with an edge length of 21.7 Å, constituting the Ammann–Kramer–Neri tiling. The refined structure converged well with the experimental diffraction diagram, with the crystallographicRfactor equal to 9.8%. The Bergman clusters were found to be bonded by four possible linkages. Only two linkages,bandc, are detected in approximant crystals and are employed to model the icosahedral QCs in the cluster approach known for the CdYb Tsai-type QC. Additional shortbandalinkages are found in this study. Short interatomic distances are not generated by those linkages due to the systematic absence of atoms and the formation of split atomic positions. The presence of four linkages allows the structure to be pictured as a complete covering by rhombic triacontahedral clusters and consequently there is no need to define the interstitial part of the structure (i.e.that outside the cluster). The 6D embedding of the solved structure is discussed for the final verification of the model.

Atomic structures of ternary Yb-Cd-Mg icosahedral quasicrystals and a 1/1 approximant
Tsunetomo Yamada; Hiroyuki Takakura; Marc de Boissieu; An-Pang Tsai
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 73, 6, 1125, 1141, Dec. 2017, [Peer-reviewed]
English, Scientific journal

Cluster environments in a twelve-fold packing model of icosahedral quasicrystals
Hiroyuki Takakura; Radosław Strzałka
Journal of Physics: Conference Series, 809, 012002, 012002, IOP Publishing, Feb. 2017, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings

Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism
T. Yamada; H. Takakura; T. Kong; P. Das; W. T. Jayasekara; A. Kreyssig; G. Beutier; P. C. Canfield; M. de Boissieu; A. I. Goldman
PHYSICAL REVIEW B, 94, 6, 060103-1, 060103-5, Aug. 2016, [Peer-reviewed]
English, Scientific journal

Atomic structure and phason modes of the Sc-Zn icosahedral quasicrystal
Tsunetomo Yamada; Hiroyuki Takakura; Holger Euchner; Cesar Pay Gomez; Alexei Bosak; Pierre Fertey; Marc de Boissieu
IUCRJ, 3, 247, 258, Jul. 2016, [Peer-reviewed]
English, Scientific journal

The quasiperiodic average structure of highly disordered decagonal Zn-Mg-Dy and its temperature dependence
Taylan Ors; Hiroyuki Takakura; Eiji Abe; Walter Steurer
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 70, 2, 315, 330, Apr. 2014, [Peer-reviewed]
English, Scientific journal

Valence Change Driven by Constituent Element Substitution in the Mixed-Valence Quasicrystal and Approximant Au-Al-Yb
Shuya Matsukawa; Katsumasa Tanaka; Mika Nakayama; Kazuhiko Deguchi; Keiichiro Imura; Hiroyuki Takakura; Shiro Kashimoto; Tsutomu Ishimasa; Noriaki K. Sato
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 83, 3, 034705-1, 034705-5, Mar. 2014, [Peer-reviewed]
English, Scientific journal

In-situ high-pressure X-ray diffraction on the Zn6Sc 1/1 periodic cubic approximant to a quasicrystal
Tsunetomo Yamada; Gaston Garbarino; Hiroyuki Takakura; Cesar Pay Gòmez; Ryuji Tamura; Marc de Boissieu
Zeitschrift für Kristallographie – Crystalline Materials, 229, 3, Walter de Gruyter GmbH, Jan. 2014, [Peer-reviewed]
Scientific journal

Short- and long-range ordering during the phase transition of the Zn6Sc 1/1 cubic approximant
Tsunetomo Yamada; Holger Euchner; Cesar Pay Gómez; Hiroyuki Takakura; Ryuji Tamura; Marc de Boissieu
Journal of Physics: Condensed Matter, 25, 20, 205405, 205405, IOP Publishing, 22 May 2013, [Peer-reviewed]
Scientific journal

Quantum critical state in a magnetic quasicrystal
Kazuhiko Deguchi; Shuya Matsukawa; Noriaki K. Sato; Taisuke Hattori; Kenji Ishida; Hiroyuki Takakura; Tsutomu Ishimasa
NATURE MATERIALS, 11, 12, 1013, 1016, Dec. 2012, [Peer-reviewed]
English, Scientific journal

Solution growth of a decagonal quasicrystal and its related periodic crystals in the Al–Ni–Ru system
Shogo Dasai; Hiroyuki Takakura
Philosophical Magazine, 91, 19-21, 2434, 2442, Informa UK Limited, 22 Oct. 2010, [Peer-reviewed], [Corresponding author]
English, Scientific journal

Structure of the fivefold surface of the Ag-In-Yb icosahedral quasicrystal
H. R. Sharma; M. Shimoda; K. Sagisaka; H. Takakura; J. A. Smerdon; P. J. Nugent; R. McGrath; D. Fujita; S. Ohhashi; A. P. Tsai
Physical Review B, 80, 12, 121401-1, 121401-4, American Physical Society (APS), 03 Sep. 2009, [Peer-reviewed]
English, Scientific journal

Geometrical property of the cluster model of the Yb–Cd icosahedral quasicrystal
H. Takakura
Philosophical Magazine, 88, 13-15, 1905, 1912, Informa UK Limited, May 2008, [Peer-reviewed], [Lead author, Last author, Corresponding author]
English, Scientific journal

Atomic dynamics of i-ScZnMg and its 1/1 approximant phase: Experiment and simulation
Mihalkovič, M.; Francoual, S.; Shibata, K.; De Boissieu, M.; Baron, A.Q.R.; Sidis, Y.; Ishimasa, T.; Wu, D.; Lograsso, T.; Regnault, L.-P.; Gähler, F.; Tsutsui, S.; Hennion, B.; Bastie, P.; Sato, T.J.; Takakura, H.; Currat, R.; Tsai, A.-P.
Philosophical Magazine, 88, 13-15, 2008, [Peer-reviewed]
English, Scientific journal

Lattice dynamics of the Zn-Mg-Sc icosahedral quasicrystal and its Zn-Sc periodic 1/1 approximant
Marc De Boissieu; Sonia Francoual; Marek Mihalkovič; Kaoru Shibata; Alfred Q.R. Baron; Yvan Sidis; Tsutomu Ishimasa; Dongmei Wu; Thomas Lograsso; Louis Pierre Regnault; Franz Gähler; Satoshi Tsutsui; Bernard Hennion; Pierre Bastie; Taku J. Sato; Hiroyuki Takakura; Roland Currat; An Pang Tsai
Nature Materials, 6, 12, 977, 984, Dec. 2007, [Peer-reviewed]
Scientific journal

An interpenetrated cluster model of p-type Zn–Mg–Ho icosahedral quasicrystal
H. Takakura; A. Yamamoto
Philosophical Magazine, 87, 18-21, 2713, 2720, Informa UK Limited, Jan. 2007, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Structure determination of quasicrystals
M. de Boissieu; H. Takakura; C. Pay Gòmez; A. Yamamoto; A. P. Tsai
Philosophical Magazine, 87, 18-21, 2613, 2633, Informa UK Limited, Jan. 2007, [Peer-reviewed]
English, Scientific journal

Atomic structure of the binary icosahedral Yb–Cd quasicrystal
Hiroyuki Takakura; Cesar Pay Gómez; Akiji Yamamoto; Marc De Boissieu; An Pang Tsai
Nature Materials, 6, 58, 63, 10 Dec. 2006, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Recent development in structure determinations for quasicrystals
A. Yamamoto; H. Takakura
Philosophical Magazine, 86, 3-5, 405, 411, Informa UK Limited, 21 Jan. 2006, [Peer-reviewed]
English, Scientific journal

Ab initio reconstruction of p-type icosahedral Zn-Mg-Ho quasicrystal structures
H. Takakura; A. Yamamoto; T. J. Sato; A. P. Tsai; Y. Ozawa; N. Yasuda; K. Toriumi
Philosophical Magazine, 86, 3-5, 621, 627, 21 Jan. 2006, [Peer-reviewed]
International conference proceedings

Magnetic excitations in the Zn-Mg-Tb icosahedral quasicrystal: An inelastic neutron scattering study
Taku J. Sato; Hiroyuki Takakura; An Pang Tsai; Kaoru Shibata
Physical Review B - Condensed Matter and Materials Physics, 73, 5, 2006, [Peer-reviewed]
Scientific journal

Five-dimensional model of the S1-superstructure phase in Al-Ni-Co quasicrystals
Akiji Yamamoto; Hiroyuki Takakura; Eiji Abe
Physical Review B, 72, 14, 144202-1, 144202-7, American Physical Society (APS), 14 Oct. 2005, [Peer-reviewed]
English, Scientific journal

Structure refinement of i-Al-Pd-Re quasicrystals by synchrotron radiation data
A Yamamoto; H Takakura; T Ozeki; AP Tsai; Y Ohashi
JOURNAL OF NON-CRYSTALLINE SOLIDS, 334, 151, 155, Mar. 2004, [Peer-reviewed]
English, Scientific journal

Experimental Study of Phonon Dynamics in the Icosahedral i-CdYb Phase and its 1/1 Periodic Approximant
S. FRANCOUAL; K. SHIBATA; M. BOISSIEU; A. Q. R. BARON; S. TSUTSUI; R. CURRAT; H. TAKAKURA; A. P. TSAI; T. A. LOGRASSO; A. R. ROSS
Ferroelectrics, 305, 1, 235, 238, Informa UK Limited, Jan. 2004, [Peer-reviewed]
English, Scientific journal

Structure Refinement of Quasicrystals
A. YAMAMOTO; H. TAKAKURA
Ferroelectrics, 305, 1, 223, 227, Informa UK Limited, Jan. 2004, [Peer-reviewed], [Last author]
English, Scientific journal

Refinement of i-Al-Cu-Fe and i-Al-Cu-Ru Quasicrystal Structures
A. YAMAMOTO; H. TAKAKURA; A. P. TSAI
Ferroelectrics, 305, 1, 279, 282, Informa UK Limited, Jan. 2004, [Peer-reviewed]
English, Scientific journal

Re-Refinement of the Basic Decagonal Al-Co-Ni Phase
H. TAKAKURA; A. YAMAMOTO; A. P. TSAI
Ferroelectrics, 305, 1, 257, 260, Informa UK Limited, Jan. 2004, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Ab Initio Structure Solution of Icosahedral Cd-Yb Quasicrystals by a Density Modification Method
H. TAKAKURA; A. YAMAMOTO; M. BOISSIEU; A. P. TSAI
Ferroelectrics, 305, 1, 209, 212, Informa UK Limited, Jan. 2004, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Relations between the six-dimensional structure of icosahedral Al-Pd-Mn and its 1/1 crystal approximants
Akiji Yamamoto; Hiroyuki Takakura
Physical Review B, 68, 13, 132201-1, 132201-4, American Physical Society (APS), 02 Oct. 2003, [Peer-reviewed], [Last author]
English, Scientific journal

Six-dimensional model of icosahedral Al-Pd-Mn quasicrystals
Akiji Yamamoto; Hiroyuki Takakura; An Pang Tsai
Physical Review B, 68, 9, 094201-1, 094201-13, American Physical Society (APS), 04 Sep. 2003, [Peer-reviewed]
English, Scientific journal

Ab initio structure determination of quasicrystals via single crystal X-ray diffraction
Hiroyuki Takakura; Akiji Yamamoto; Marc De Boissieu; Taku J. Sato; An Pang Tsai
Materials Research Society Symposium - Proceedings, 805, 73, 82, 2003, [Peer-reviewed]
International conference proceedings

Ab initio structure determination of quasicrystals by density modification method
H. Takakura; A. Yamamoto; M. Shiono; T. J. Sato; A. P. Tsai
Journal of Alloys and Compounds, 342, 1-2, 72, 76, 14 Aug. 2002, [Peer-reviewed]
Scientific journal

Dynamics of the ZnMgY icosahedral phase
K. Shibata; M. De Boissieu; R. Currat; T. Sato; A. P. Tsai; H. Takakura
Journal of Alloys and Compounds, 342, 1-2, 278, 282, 14 Aug. 2002, [Peer-reviewed]
Scientific journal

Magnetic correlations in the Cd-Mg-Tb icosahedral quasicrystal
Taku J. Sato; Hiroyuki Takakura; Junqing Guo; An Pang Tsai; Taku J. Sato; Hiroyuki Takakura; Junqing Guo; An Pang Tsai; Kenji Ohoyama
Journal of Alloys and Compounds, 342, 1-2, 365, 368, 14 Aug. 2002, [Peer-reviewed]
Scientific journal

Structure refinement of i-Al–Pd–Mn quasicrystals by IP-Weissenberg camera data
Akiji Yamamoto; H. Takakura; A.P. Tsai
Journal of Alloys and Compounds, 342, 1-2, 159, 163, Elsevier BV, Aug. 2002, [Peer-reviewed]
English, Scientific journal

Phason fluctuations in i-AlPdRe and i-CdYb phases
M de Boissieu; H Takakura; M Bletry; J.Q Guo; A.P Tsai
Journal of Alloys and Compounds, 342, 1-2, 265, 270, Elsevier BV, Aug. 2002, [Peer-reviewed]
English, Scientific journal

Structure Analysis of Quasicrystals by Density Modificatton Method
TAKAKURA Hiroyuki
X-RAYS, 44, 2, 114, 120, The Crystallographic Society of Japan, 30 Apr. 2002, [Peer-reviewed]
Japanese, A novel density modification method has been applied to phase reconstruction of X-ray single crystal data of quasicrystals. This is based on the low density elimination (LDE) method that is an ab initio structure determination method for crystals in the real space. The location, size andshape of the occupation domains of quasicrystals in the n-dimensional (nD) unit cell are obtained without a prioi model structure. Therefore, the LDE method can be a substitute for the direct method for quasicrystals that are described as nD crystals. The structure solution can easily be found in the trial sets (normally 100 sets) and is confirmed by the subsequent analysis. The result is used as a starting model for constructing a detailed structure model of quasicrystals. The solution of several qusicrystalline structures including a model quasicrystal structure are exemplified.

Dynamics of the ZnMgY icosahedral phase
K. Shibata; R. Currat; M. De Boissieu; T. J. Sato; H. Takakura; A. P. Tsai
Journal of Physics Condensed Matter, 14, 8, 1847, 1863, 04 Mar. 2002, [Peer-reviewed]
Scientific journal

Crystal and quasicrystal structures in Cd?Yb and Cd?Ca binary alloys
Hiroyuki Takakura; Junqing Guo; An Pang Tsai
Philosophical Magazine Letters, 81, 6, 411, 418, Informa UK Limited, Jun. 2001, [Lead author, Corresponding author]
English, Scientific journal

Ho arrangement in the Zn6Mg3Ho icosahedral quasicrystal studied by atomic-resolution Z-contrast STEM
E. Abe; H. Takakura; A. Tsai
Microscopy, 50, 3, 187, 195, Oxford University Press (OUP), 01 May 2001, [Peer-reviewed]
English, Scientific journal

Data collection of quasicrystals by IP Weissenberg camera
A. Yamamoto; H. Takakura; A. P. Tsai
Ferroelectrics, 250, 1, 309, 312, Informa UK Limited, Feb. 2001, [Peer-reviewed]
English, Scientific journal

Ab initiostructure solutions of quasicrystals by a density modification method
Masaaki Shiono; Hiroyuki Takakura; Akiji Yamamoto
Ferroelectrics, 250, 1, 293, 296, Informa UK Limited, Feb. 2001, [Peer-reviewed]
English, Scientific journal

Growth of the Al-Pd-Re and Al-Cu-Fe single quasicrystals
J. Q. Guo; T. J. Sato; E. Abe; H. Takakura; A. P. Tsai
Ferroelectrics, 250, 1-4, 253, 256, Feb. 2001, [Peer-reviewed]
Scientific journal

Structure of icosahedral Zn-Mg-Ho quasicrystals determined by a density modification method
H. Takakura; M. Shiono; T. J. Sato; A. Yamamoto; A. P. Tsai
Ferroelectrics, 250, 1, 301, 304, Feb. 2001, [Peer-reviewed]
Scientific journal

Ab InitioStructure Determination of Icosahedral Zn-Mg-Ho Quasicrystals by Density Modification Method
Hiroyuki Takakura; Masaaki Shiono; Taku J. Sato; Akiji Yamamoto; An Pang Tsai
Physical Review Letters, 86, 2, 236, 239, American Physical Society (APS), 08 Jan. 2001, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Refinement of d-AlNiCo quasicrystal structures
Hiroyuki Takakura; Akiji Yamamoto; An Pang Tsai
Materials Research Society Symposium - Proceedings, 643, K991, K996, 2001, [Peer-reviewed]
English, International conference proceedings

The structure of a decagonal Al72Ni20Co8quasicrystal
Hiroyuki Takakura; Akiji Yamamoto; An Pang Tsai
Acta Crystallographica Section A: Foundations of Crystallography, 57, 5, 576, 585, Blackwell Publishing Ltd, 2001, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Magnetic correlations in the Zn-Mg-rare-earth icosahedral quasicrystals
Taku J. Sato; Hiroyuki Takakura; An Pang Tsai; Kenji Ohoyama; Kaoru Shibata; Ken H. Andersen
Materials Science and Engineering A, 294-296, 481, 487, 15 Dec. 2000, [Peer-reviewed]
Scientific journal

Heat capacities of icosahedral and hexagonal phases of Zn–Mg–Y system
Akira Inaba; Hiroyuki Takakura; An-Pang Tsai; I.R Fisher; P.C Canfield
Materials Science and Engineering: A, 294-296, 723, 726, Elsevier BV, Dec. 2000, [Peer-reviewed]
English, Scientific journal

A stable binary quasicrystal
A. P. Tsai; J. Q. Guo; E. Abe; H. Takakura; T. J. Sato
Nature, 408, 6812, 537, 538, Springer Science and Business Media LLC, Nov. 2000, [Peer-reviewed]
English, Scientific journal

An electron microscopic study of hexagonal phases related to quasicrystals in Zn–Mg–RE alloys
A Singh; E Abe; H Takakura; A.P Tsai
Micron, 31, 5, 499, 505, Elsevier BV, Oct. 2000, [Peer-reviewed]
English, Scientific journal

Production of single quasicrystals and their electrical resistivity in the Al-Pd-Re system
J. Q. Guo; T. J. Sato; E. Abe; H. Takakura; A. P. Tsai
Philosophical Magazine Letters, 80, 7, 495, 502, Jul. 2000, [Peer-reviewed]
Scientific journal

Antiferromagnetic spin correlations in the Zn-Mg-Ho icosahedral quasicrystal
Taku J. Sato; Hiroyuki Takakura; An Pang Tsai; Kaoru Shibata; Kenji Ohoyama
Physical Review B - Condensed Matter and Materials Physics, 61, 1, 476, 486, 2000, [Peer-reviewed]
Scientific journal

Hexagonal superstructures in the Zn–Mg–rare-earth alloys
E Abe; H Takakura; A Singh; A.P Tsai
Journal of Alloys and Compounds, 283, 1-2, 169, 172, Elsevier BV, Feb. 1999, [Peer-reviewed]
English, Scientific journal

Neutron scattering study of the Zn-Mg-Ho icosahedral quasicrystal
T. J. Sato; H. Takakura; A. P. Tsai; K. Shibata; K. Ohoyama; K. H. Andersen
Journal of Physics and Chemistry of Solids, 60, 8, 1257, 1259, 1999, [Peer-reviewed]
Scientific journal

Crystal structure of hexagonal phases and its relation to icosahedral quasicrystalline phase in Zn-Mg-Re (RE = rare earth) system
Hiroyuki Takakura; T. J. Sato; A. P. Tsai; A. Sato; A. Yamamoto
Materials Research Society Symposium - Proceedings, 553, 129, 134, 1999, [Peer-reviewed]
Scientific journal

Neutron scattering study of antiferromagnetic correlations in the Zn-Mg-Ho icosahedral quasicrystal
Taku J. Sato; Hiroyuki Takakura; An Pang Tsai; Kaoru Shibata; Kenji Ohoyama; Ken H. Andersen
Materials Research Society Symposium - Proceedings, 553, 415, 426, 1999, [Peer-reviewed]
Scientific journal

A frustrated rotation of trimethylammonium molecule in (CH₃)₃NHCl studied by inelastic neutron scattering
T. Oya; S. Gondo; H. Takakura; M. Machida; N. Achiwa
Ferroelectrics, 218, 1, 45, 52, Informa UK Limited, Oct. 1998, [Peer-reviewed]
English, Scientific journal

Anisotropic spin correlations in the zn-mg-ho icosahedral quasicrystal
Taku J. Sato; Hiroyuki Takakura; An Pang Tsai; Kaoru Shibata
Physical Review Letters, 81, 11, 2364, 2367, 14 Sep. 1998, [Peer-reviewed]
Scientific journal

Crystal structure of a hexagonal phase and its relation to a quasicrystalline phase in Zn-Mg-Y alloy
H. Takakura; A. Sato; A. Yamamoto; A. P. Tsai
Philosophical Magazine Letters, 78, 3, 263, 270, Informa UK Limited, Sep. 1998, [Lead author, Corresponding author]
English, Scientific journal

Single crystal growth of the icosahedral Zn-Mg-Ho quasicrystal
Taku J. Sato; Hiroyuki Takakura; An Pang Tsai
Japanese Journal of Applied Physics, Part 2: Letters, 37, 6 A, 01 Jun. 1998, [Peer-reviewed]
Scientific journal

Calorimetric Study on Glass Transition of Plastically Crystalline Cyanoadamantane
M. Ishikawa; O. Yamamuro; T. Matsuo; H. Takakura; N. Achiwa
J. Korean Phys. Soc., 32, S842, S844, Feb. 1998, [Peer-reviewed]
English

Molecular orientational correlations in cyanoadamantane studied by X-ray diffuse scattering
H. Takakura; N. Achiwa
29, S533, S536, Nov. 1996, [Peer-reviewed], [Lead author]
English

The effect of pressure on the Néel temperature of URu2Si2
K Iki; G Oomi; Y Uwatoko; H Takahashi; N Mōri; Y Ōnuki; T Komatsubara
Journal of Alloys and Compounds, 181, 1-2, 71, 75, Elsevier BV, Apr. 1992, [Peer-reviewed]
English, Scientific journal

Effect of pressure on the thermal expansion coefficient of the heavy fermion material CeCu2Si2
H. Takakura; K. Iki; H. Okita; Y. Uwatoko; G. Oomi; Y. Ōnuki; T. Komatsubara
Journal of Magnetism and Magnetic Materials, 90-91, 453, 455, Elsevier BV, Dec. 1990, [Peer-reviewed], [Lead author]
English, Scientific journal

Spin correlations and lattice dynamics in quasicrystals
出口和彦; 松浦直人; 那波和宏; 佐藤卓; 石川明日香; LABIB Farid; 田村隆治; 張晋嘉; 上村祥史; 枝川圭一; 高倉洋礼; 梶本亮一; 池内和彦, 量子ビームサイエンスフェスタ(Web), 2024, 2025

Spin correlations and lattice dynamics in quasicrystals
出口和彦; 松浦直人; 那波和宏; 佐藤卓; 石川明日香; LABIB Farid; 田村隆治; 張晋嘉; 上村祥史; 枝川圭一; 高倉洋礼; 梶本亮一; 池内和彦, 量子ビームサイエンスフェスタ(Web), 2023, 2024

A novel antiferromagnetic order in Heisenberg 1/1 quasicrystal approximant
LABIB Farid; SUGIMOTO Takanori; SUGIMOTO Takanori; SUGIMOTO Takanori; TAKAKURA Hiroyuki; ISHIKAWA Asuka; TAMURA Ryuji, 日本物理学会講演概要集(CD-ROM), 79, 2, 2024

Spin correlations and lattice dynamics in quasicrystals
出口和彦; 松浦直人; 那波和宏; 佐藤卓; 石川明日香; LABIB Farid; 田村隆治; 張晋嘉; 上村祥史; 枝川圭一; 高倉洋礼; 梶本亮一; 池内和彦, 量子ビームサイエンスフェスタ(Web), 2022, 2023

Structure transitions of the quasicrystalline 1/1 approximant in the Cd-Mg-Ce system
FARID Labib; FUJITA Nobuhisa; OHHASHI Satoshi; TAKAKURA Hiroyuki; SHIINO Takayuki; TSAI An-Pang; TAMURA Ryuji, 日本金属学会講演大会(Web), 171st, 2022

7pBE-1 Cluster local environments in Tsai-type icosahedral quasicrystals
Takakura H., Meeting abstracts of the Physical Society of Japan, 69, 2, 560, 560, 22 Aug. 2014
The Physical Society of Japan (JPS), Japanese

30aCB-8 Multiple X-ray diffraction of an AlCuRu icosahedral quasicrystal II
Takakura H.; Mizuno R., Meeting abstracts of the Physical Society of Japan, 69, 1, 816, 816, 05 Mar. 2014
The Physical Society of Japan (JPS), Japanese

30aCB-3 Five dimensional structure analysis of Al-Cu-Rh decagonal
Sakakura M.; Takakura H., Meeting abstracts of the Physical Society of Japan, 69, 1, 815, 815, 05 Mar. 2014
The Physical Society of Japan (JPS), Japanese

30aCB-9 Study of Symmetry Breaking in the Cd-Yb Icosahedral Quasicrystal by Single-Crystal X-Ray Diffraction
Yamada To.; Watanuki T.; Machida A.; Takakura H.; Saito A.; Yamamoto A.; Tsai A. P., Meeting abstracts of the Physical Society of Japan, 69, 1, 816, 816, 05 Mar. 2014
The Physical Society of Japan (JPS), Japanese

Six-dimensional model of Al-based F-type icosahedral quasicrystals
Takakura H.; Boissieu de Marc, Meeting abstracts of the Physical Society of Japan, 68, 2, 708, 708, 26 Aug. 2013
The Physical Society of Japan (JPS), Japanese

27aPS-38 Physical properties of the Au-Al-Yb quasicrystal and its related quasi- and approximant-crystals
Matsukawa S.; Nakayama M.; Imura K.; Deguchi K.; Sato N. K.; Tanaka K.; Yamamoto S.; Takakura H.; Ishimasa T.; Matsubayashi K.; Uwatoko Y., Meeting abstracts of the Physical Society of Japan, 68, 1, 618, 618, 26 Mar. 2013
The Physical Society of Japan (JPS), Japanese

27aPS-89 Transport properties of the Au-Al-Tm quaslcrystal
Nakayama M.; Matsukawa S.; Imura K.; Deguchi K.; Sato N. K.; Tanaka K.; Yamamoto S.; Tanaka Y.; Takakura H.; Ishimasa T., Meeting abstracts of the Physical Society of Japan, 68, 1, 631, 631, 26 Mar. 2013
The Physical Society of Japan (JPS), Japanese

29pEP-9 Multiple X-ray diffraction of an AlCuRu Icosahedral Quasicrystal
Mizuno R.; Takakura H., Meeting abstracts of the Physical Society of Japan, 68, 1, 897, 897, 26 Mar. 2013
The Physical Society of Japan (JPS), Japanese

21aFH-12 Transport measurements on the Au-Al-Yb quasicrystal under high pressure and magnetic field
Matsukawa S.; Deguchi K.; Sato N. K.; Yamamoto S.; Takakura H.; Ishimasa T., Meeting abstracts of the Physical Society of Japan, 67, 2, 580, 580, 24 Aug. 2012
The Physical Society of Japan (JPS), Japanese

20aCA-2 Structure refinement of Mg-Cd-Yb icosahedral quasicrystal
Takakura Hiroyuki; Tsai An-Pang, Meeting abstracts of the Physical Society of Japan, 67, 2, 738, 738, 24 Aug. 2012
The Physical Society of Japan (JPS), Japanese

27aGF-9 Structure studies of Al-Ni-Ru decagonal quasicrystal by CBED and HAADF-STEM
Yokoyama D.; Saitoh K.; Tanaka N.; Takakura H., Meeting abstracts of the Physical Society of Japan, 67, 1, 858, 858, 05 Mar. 2012
The Physical Society of Japan (JPS), Japanese

27pGF-5 Physical Properties of Icosahedral Au-Al-Yb Quasicrystal at Low Temperature
Deguchi K.; Matsukawa S.; Sato N.K.; Yamamoto S.; Takakura H.; Ishimasa T., Meeting abstracts of the Physical Society of Japan, 67, 1, 866, 866, 05 Mar. 2012
The Physical Society of Japan (JPS), Japanese

24aYB-10 Quantum Critical Phenomena of Icosahedral Au-Al-Yb Quasicrystal
Deguchi K.; Matsukawa S.; Sato N. K.; Yamamoto S.; Takakura H.; Ishimasa T., Meeting abstracts of the Physical Society of Japan, 67, 1, 546, 546, 05 Mar. 2012
The Physical Society of Japan (JPS), Japanese

24pPSB-72 Transport measurements on the Au-Al-Yb quasicrystal
Matsukawa S.; Deguchi K.; Sato N.K.; Yamamoto S.; Takakura H.; Ishimasa T., Meeting abstracts of the Physical Society of Japan, 67, 1, 581, 581, 05 Mar. 2012
The Physical Society of Japan (JPS), Japanese

22pGD-3 Structure of an orthorhombic phase in the Al-Cu-Rh system related to the decagonal quasicrystal with 1.6 nm period
Takakura Hiroyuki, Meeting abstracts of the Physical Society of Japan, 66, 2, 809, 809, 24 Aug. 2011
The Physical Society of Japan (JPS), Japanese

27pEG-7 Five-dimensional structure analysis of Al-Ni-Ru decagonal quasicrystal
Takakura Hiroyuki; Dasai Shogo; Yamamoto Akiji, Meeting abstracts of the Physical Society of Japan, 66, 1, 835, 835, 03 Mar. 2011
The Physical Society of Japan (JPS), Japanese

24pXL-9 Structural model of Al-Ni-Ru decagonal quasicrystal with 1.6 nm periodicity
Takakura Hiroyuki; Dasai Shogo; Yamamoto Akiji, Meeting abstracts of the Physical Society of Japan, 65, 2, 754, 754, 18 Aug. 2010
The Physical Society of Japan (JPS), Japanese

21pHY-11 X-ray crystal structural analysis of orthorhombic Al_<13>(Ni,Ru)_4 approximant crystal
Dasai Shogo; Takakura Hiroyuki, Meeting abstracts of the Physical Society of Japan, 65, 1, 834, 834, 01 Mar. 2010
The Physical Society of Japan (JPS), Japanese

25aYB-1 The formation condition of Zn-Mg-Dy decagonal quasicrystal 2
Izumi T.; Takakura H.; Kashimoto S., Meeting abstracts of the Physical Society of Japan, 64, 2, 689, 689, 18 Aug. 2009
The Physical Society of Japan (JPS), Japanese

21aYJ-2 The study of the structure phase transition of Zn_6Sc 1/1 approximant crystals by the powder crystal structure analysis
Torigoe S.; Takakura H.; Yamamoto A.; Tanaka M., Meeting abstracts of the Physical Society of Japan, 63, 2, 700, 700, 25 Aug. 2008
The Physical Society of Japan (JPS), Japanese

24pWA-6 Atomic structure of the Yb-Cd icosahedral quasicrystal
Takakura Hiroyuki, Meeting abstracts of the Physical Society of Japan, 63, 1, 774, 774, 29 Feb. 2008
The Physical Society of Japan (JPS), Japanese

20aYK-8 Heat capacity of icosahedral ZnMgRE quasicrystals at low temperature
Kanki Daisuke; Takakura Hiroyuki; Sato Taku J; Inaba Akira, Meeting abstracts of the Physical Society of Japan, 60, 2, 641, 641, 19 Aug. 2005
The Physical Society of Japan (JPS), Japanese

Structure refinements of a decagonal Al_<72>Ni_<20>Co_8 quasicrystatal using synchrotron radlation x-ray diffraciton data
Takakura Hiroyuki; Yamamoto Akiji; Tsai An Pang, Meeting abstracts of the Physical Society of Japan, 58, 1, 772, 772, 06 Mar. 2003
The Physical Society of Japan (JPS), Japanese

Application of the LDE method to a composite crystal structure
Shigeta H.; Shiono M.; Takakura H., Meeting abstracts of the Physical Society of Japan, 57, 2, 837, 837, 13 Aug. 2002
The Physical Society of Japan (JPS), Japanese

24aXE-8 Structure analysis of icosahedral ZnMgSc quasicrystals by the LDE method
Takakura Hiroyuki; Yamamoto Akiji; Kaneko Yasushi; Ishimasa Tsutomu; Tsai An Pang, Meeting abstracts of the Physical Society of Japan, 57, 1, 720, 720, 01 Mar. 2002
The Physical Society of Japan (JPS), Japanese

24aXE-7 Generalized 6 -dimensional model of icosahedral quasicrystals
Yamamoto A.; Takakura H., Meeting abstracts of the Physical Society of Japan, 57, 1, 720, 720, 01 Mar. 2002
The Physical Society of Japan (JPS), Japanese

Structure Determination of Quasicrystals by Low Density Elimination Method
Takakura Hiroyuki; Shiono Masaaki, Meeting abstracts of the Physical Society of Japan, 55, 2, 660, 660, 10 Sep. 2000
The Physical Society of Japan (JPS), Japanese

Shirt Range spin Correlations in the Zn-Mg-RE Icosahedral Quasicrystals
SATO Taku J; TAKAKURA Hiroyuki; TSAI AnPang; SHIBATA Kaoru, Materia Japan, 39, 8, 675, 678, 20 Aug. 2000
The Japan Institute of Metals and Materials, Japanese

Six-dimensional structure model for F-type Al-based icosahedral quasicrystals
Tsunetomo Yamada; Hiroyuki Takakura; Akiji Yamamoto
11th Hyper Material Meeting, 06 Mar. 2024, Japanese, Oral presentation
05 Mar. 2024 - 07 Mar. 2024, 44581838;44584968

Current Status of Semiconducting Quasicrystal Search
Kaoru Kimura; Yutaka Iwasaki; Koichi Kitahara; Yoshiki Takagiwa; Jyunpei Okada; Takanobu Hiroto; Kunio Yubuta; Sota Tanaka; Asuka Ishikawa; Ryuji Tamura; Erina Fujita; Yukari Katsura; Minoru Kusaba; Chang Liu; Ryo Yoshida
11th Hyper Material Meeting, 06 Mar. 2024, Japanese, Oral presentation
05 Mar. 2024 - 07 Mar. 2024, 44581838;44584968

Lattice dynamics in quasicrystals
Masato Matsuura; Zhang Jinjia; Yasushi Kamimura; Hiroyuki Takakura; Maiko Kofu; Daisuke Ishikawa; Alfred Q. R. Baron
11th Hyper Material Meeting, 05 Mar. 2024, Japanese, Oral presentation
05 Mar. 2024 - 07 Mar. 2024, 44584968

Visualization of quasicrystal data by VESTA
Koichi Momma; Hiroyuki Takakura
11th Hyper Material Meeting, 05 Mar. 2024, Japanese, Oral presentation
05 Mar. 2024 - 07 Mar. 2024, 44584968

Structural characterization of natural quasicrystals by synchrotorn X-ray diffraction
Hiroyuki Takakura; Kodai Mizunuma; Satoshi Mizutani; Tsunetomo Yamada; L. Bindi; M. de Boisseu; A. Bosak; F. Formisano; L. Paolasini; P. J. Steinhard
11th Hyper Material Meeting, 05 Mar. 2024, Japanese, Oral presentation
05 Mar. 2024 - 07 Mar. 2024, 44584968;44581838

High-resolution X-ray characterization of natural decagonal AlNiFe quasicrystals
Satoshi Mizutani; L. Bindi; M. de Boisseu; A. Bosak; F. Formisano; L. Paolasini; P. J. Steinhard; Tsunetomo Yamada; Hiroyuki Takakura
28th Quasicrystals meeting, 19 Dec. 2023, Japanese, Oral presentation
18 Dec. 2023 - 20 Dec. 2023

High-resolution X-ray characterization of natural icosahedral AlCuFe quasicrystals
Kodai Mizunuma; L. Bindi; M. de Boisseu; A. Bosak; F. Formisano; L. Paolasini; P. J. Steinhard; Tsunetomo Yamada; Hiroyuki Takakura
28th Quasicrystals meeting, 19 Dec. 2023, Japanese, Oral presentation
18 Dec. 2023 - 20 Dec. 2023, 44584968

Non-cubic rational approximants to Bergman-type icosahedral quasicrytals
Hiroyuki Takakura
International Conference on Complex Orders in Condensed Matter:aperiodic order, local order, electronic order, hidden order, 2023, Poster presentation
24 Sep. 2023 - 29 Sep. 2023, 44584968

Phase Equilibria and New Compounds in Al–Ru–Si System at 1200 K
Koichi Kitahara; Hiroyuki Takakura; Yutaka Iwasaki; Kaoru Kimura
日本金属学会 2023 年秋期 (第 173 回) 講演大会, 22 Sep. 2023, Japanese, Oral presentation
19 Sep. 2023 - 26 Sep. 2023, 44584968

Cluster covering structure in a 3/2-2/1-2/1 rational approximant to Bergman type icosahedral quasicrystals
Hiroyuki Takakura
15th International Conference on Quasicrystals, 19 Jun. 2023, English, Invited oral presentation
18 Jun. 2023 - 23 Jun. 2023, 44584968, [Invited]

Structural disorder in a Bergman-type Al-Zn-Mg 2/1 approximant crystal
Hiroyuki Takakura; Satoshi Mizutani
10th Hyper Material Meeting, 30 May 2023, Japanese, Oral presentation
29 May 2023 - 31 May 2023, 44584968

Structure of a 3/2-2/1-2/1 approximant crystal in Mg-Ga-Al-Zn system
Ryota Kikuchi; Hiroyuki Takakura
日本物理学会 2023年春季大会, 23 Mar. 2023, Japanese, Oral presentation
22 Mar. 2023 - 25 Mar. 2023, 44584968

Structure of a 3/2-2/1-2/1 approximant crystal in Mg-Ga-Al-Zn system
Ryota Kikuchi; Hiroyuki Takakura
9th Hyper Material Meeting, 21 Dec. 2022, Japanese, Oral presentation
20 Dec. 2022 - 22 Dec. 2022

High Temperature Powder X-ray Diffraction Study of AlCuRu Icosahedral Quasicrystals I
Hiroyuki Takakura; Takanobu Hiroto; Yoshitaka Matushita
日本物理学会 2022年秋季大会, 12 Sep. 2022, Japanese, Oral presentation
12 Sep. 2022 - 15 Sep. 2022

Quasicrystals I II
Hiroyuki Takakura
The 5th International School on Aperiodic Crystals, 25 May 2022, English, Public discourse
23 May 2022 - 27 May 2022, [Invited]

Structure of P-type Zn-Mg-Zr icosahedral quasicrystal
Hiroyuki Takakura; Takahito Endo
8th Hyper Material Meeting, 19 Apr. 2022, Japanese, Oral presentation
18 Apr. 2022 - 20 Apr. 2022, 44584968

Formation and atomic structure of Cd-Mg-Ce 1/1 approximant
Farid Labib; 藤田伸尚; 高倉洋礼; Takayuki Shiino; 蔡安邦; 田村隆治
8th Hyper Material Meeting, 18 Apr. 2022, English, Oral presentation
18 Apr. 2022 - 20 Apr. 2022

Nucleation behavior and lattice match of stable icosahedral phase in a Mg-Zn-Al alloy
Alok Singh; Hiroyuki Takakura; Takanobu Hiroto; Machiko Ode; Hidetoshi Somekawa; Toru Hara
Materials Research Meeting 2021 Symposium B-1, 15 Dec. 2021, English, Oral presentation
13 Dec. 2021 - 16 Dec. 2021, 44584968

Cluster covering structure in an orthorhombic approximant crystal to Al-Zn-Mg icosahedral quasicrystal
Hiroyuki Takakura
Materials Research Meeting 2021 Symposium B-1, 15 Dec. 2021, English, Oral presentation
13 Dec. 2021 - 16 Dec. 2021, 44584968

クラスターに基づいた正10角形準結晶の構造モデル
高倉 洋礼
第6回ハイパーマテリアル・セミナー, 15 Jan. 2020, Japanese
15 Jan. 2020 - 15 Jan. 2020, [Invited]

Introduction to higher-dimensional description of quasicrystal structures
Hiroyuki Takakura
Interdisciplinary Symposium for Quasicrystals and Strongly Correlated Systems, 23 Jun. 2019, English, Invited oral presentation
23 Jun. 2019 - 27 Jun. 2019, [Invited]

結晶物性特論, 2024年, 修士課程, 工学院

結晶物性特論, 2024年, 博士後期課程, 工学院

固体物理学Ⅰ, 2024年, 学士課程, 工学部

熱力学, 2024年, 学士課程, 工学部

結晶工学, 2024年, 学士課程, 工学部

結晶工学, 2024年, 学士課程, 工学部

Present
The Japanese Society for Neutorn Science

Present
The Physical Society of Japan

Present
The Crystallographic Society of Japan

Hypermaterials: Inovation of materials science in hyper space
Grants-in-Aid for Scientific Research
28 Jun. 2019 - 31 Mar. 2024
田村 隆治; 木村 薫; 高倉 洋礼; 吉田 亮; 出口 和彦; 上田 那由多; 高際 良樹
総括班の活動実績を以下に述べる。令和二年度は、領域会議（第3回(2020/5/19、参加者54名)、第4回（2020/7/15～17、参加者79名）、第5回（2020/12/8～10、参加者59名））、第25回準結晶研究会（第2回ハイパーマテリアル若手研究会を兼ねる）（2021/3/3～5、参加者70名）、第1回若手研究会（2020/5/28、参加者67名）、ハイパーマテリアルセミナー（第8回（2020/7/20）、第9回（2020/7/31）、第10回（2020/10/01、参加者32名）、第11回（2020/10/15、参加者39名）、第12回（2020/11/26）、第13回（2021/1/12、参加者27名）、第14回（2021/2/1、参加者36名）、第15回（2021/2/24、参加者29名））、第14回物性科学領域横断研究会（2020/12/4～5）を開催し、領域内の有機的連携を促進するとともに、計画研究および公募研究の進捗状況の把握・共有を図った。また、班内・班間留学システム、共用設備利用のための研究者循環システムを戦略的に活用し、重点課題にかかわる共同研究に助教・ポスドク・大学院生などの若手研究者をダイナミカルに編成することを通じて、領域内の連携やな共同研究を後押しするとともに、経験豊かな若手研究者の育成にも努めた。得られた研究成果は、プレスリリース、領域ホームページ、ニュースレターを通じてすみやかに社会に配信した。特筆すべき実績として、まず、当初の予定になかったオンラインによるサイトビジットを領域全メンバー（計画班・公募班）に対して実施したことが挙げられる。これにより、本領域のミッション、各課題の目的・内容・問題点の相互共有、共同研究の斡旋を行い、領域内の連携が大きく活発化されたことが挙げられる。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Tokyo University of Science, 19H05817

Structure of hypermaterials
Grants-in-Aid for Scientific Research
Jun. 2019 - Mar. 2024
高倉 洋礼; 綿貫 徹; 松浦 直人; 門馬 綱一; 松下 能孝; 藤田 伸尚
高次元と高対称で特徴づけられるハイパーマテリアルの構造的側面に焦点をあて、その原子スケールからマクロスケールまでの静的・動的構造を組織的に解明し、その構造的知見にもとづいて、個々の物質群を越えて、ハイパーマテリアルが普遍的に示す安定化機構や、特異な物性機能を理解するための補空間物質科学の構築の基礎を与えるのが目的である。他の計画研究と協働し構造情報・補空間情報を共有することにより、本新学術領域が目指す「実空間では複雑怪奇なハイパーマテリアルの原子的挙動、磁気・電子・フォノン状態等を補空間で明快に記述することで、複雑な秩序に潜む隠れた法則性を高次元空間において描き出し、
新たな物質科学を創出する」という目標達成に寄与する。今年度はAl-Cu-Ru系準結晶の良質単準結晶の育成条件を明らかにするとともに、Al-Pd-TM（TM=遷移金属）系準結晶・近似結晶の相形成や構造に対する第三元素置換の効果を調べ、相安定性と遍歴電子濃度やｄ軌道占有率との相関性を見出した。さらに、Al-Pd-Cr-Fe系等における高次近似結晶相が深い擬ギャップを持つことを硬Ｘ線光電子分光により示した。Cd-Mg-RE（RE=希土類）系近似結晶及び準結晶の磁性と構造乱れの関係を明らかにした。放射光コヒーレントX線回折イメージング法を整備し、Al-Cu-Ru1/1近似結晶のナノドメイン構造の3次元可視化を実施した。中性子散乱によりAl-Pd-Mn準結晶の音響フォノンの精密測定を行った。また、X線非弾性散乱によるAl-Cu-Ru準結晶の高温フォノンの予備実験を行った。実験室系粉末X線回折法用高真空対応型電気炉の導入を行い、高温実験環境を整えた。また、高次元情報を保ったまま、結晶構造や補空間の形状など各種情報を可視化できるよう、構造可視化ソフトウェアの拡張を行ない、トポロジー探索のための基礎的コードを整備した。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Hokkaido University, 19H05819

Growth of high-quality single quasicrystals and analysis of their atomic structures
Grants-in-Aid for Scientific Research
01 Apr. 2019 - 31 Mar. 2022
Takakura Hiroyuki
The purpose of this study was to explore and establish conditions for growing single quasicrystal samples of icosahedral quasicrystals, to grow pure single quasicrystal samples, and to elucidate the atomic structure of quasicrystals with unknown structure by crystal structure analysis using these samples. In this study, we clarified the conditions for growing good quality single quasicrystals of Al-Cu-Ru icosahedral quasicrystals by the self-flux method. We have also succeeded in analyzing the structure of Zn-Mg-Tm icosahedral quasicrystals. We also found a new low-order approximant in the Al-Zn-Mg system, which has never been reported as an approximant of icosahedral quasicrystals.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 19K04982

Lattice defects (nano-twin) and origin of activity for bulk metallic catalysts
Grants-in-Aid for Scientific Research
01 Apr. 2015 - 31 Mar. 2019
Tsai Anpang
We have proposed a new mechanism for creation of catalytically active sites in porous Au. The existence of low-coordinated atomic sites on the surface is essential for understanding the catalytic activity of nanostructured Au. Samples of porous Au prepared by leaching Al2Au exhibit high catalytic activity towards CO oxidation. The presence of quite common nano-twins in the fcc lattice of porous Au significantly correlates with the catalytic activity. On the {211} surfaces of porous Au the twin boundaries can form chains of atoms with coordination number CN=6, which is denoted as W-chains. In contrast to the usually considered isolated low-coordinated active sites in Au as the corners of nanoparticles or the kinks on stepped of surfaces the W-chains form long rows of active Au sites. DFT calculations show that on the W-chains O2 chemisorbs and activated.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Tohoku University, 15H02299

Study on a novel quantum state driven by strongly correlated effect in quasicrystals
Grants-in-Aid for Scientific Research
01 Apr. 2015 - 31 Mar. 2019
Sato Noriaki; Deguchi Kazuhiko; Imura Keiichiro; Ishimasa Tsutomu; Takakura Hiroyuki
Quasicrystal is distinguished from a conventional, periodic crystal. Here, periodicity is a mathemtical concept and plays an important role in condensed matter physics. In this project, we have revealed a novel mechanism of the quantum critical phenomenon observed in a rare-earth-based quasicrystal. We have also succeeded in, for the first time, discovering superconductivity in quasicrystals.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Nagoya University, 15H02111

Structure analysis of icosahedral quasicrystals containing rare-earth elements and related complex metallic alloys
Grants-in-Aid for Scientific Research
01 Apr. 2015 - 31 Mar. 2018
Takakura Hiroyuki
In this project, experimental and theoretical investigations have been conducted focusing on icosahedral quasicrystals containing rare-earth elements, in order to gain structural knowledge about unsolved Tsai-type icosahedral quasicrystals. Several icosahedral quasicrystal structures, which include R-Cd(R=Gd,Dy,Tm), Yb-Cd-Mg, and Sc-Zn icosahedral quasicrystls, have been determined by means of single-crystal X-ray diffraction. In addition, it has been revealed that a substantial amount of diffuse scattering with anisotropic distribution, located around the strong Bragg peaks, observed in Sc-Zn icosahedral quasicrystls can be fully interpreted as resulting from phason fluctuations associated with the chemical disorder of Sc sites form an absolute measurement of diffuse X-ray scattering.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 15K04659

Structural study of F-type iclsahedral quasicrystals and related compounds in Al-transition metal alloys
Grants-in-Aid for Scientific Research
01 Apr. 2013 - 31 Mar. 2016
Fujita Nobuhisa; TAKAKURA HIROYUKI; TSAI AN-PANG
Although more than 30 years have passed since quasicrystals were discovered, their structural details have remained to be unclarified to a large extent posing one of the greatest mysteries in materials science. In order to elucidate the structure of Al-based icosahedral quasicrystals, we first aim at searching for novel approximant phases, namely crystals with similar local structures to that of the quasicrystals. Then we attempt to analyze the structure of new approximants using single-crystal X-ray diffraction to extract any information regarding the structural propserties of the quasicrystals. Overall, these attempts culminate in the discoveries of a few novel approximant crystals, whereas their structures turn out to be composed of two kinds of clusters forming a dense packing. We also propose a new theoretical model describing the arrangement of the clusters in the quasicrystals.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Tohoku University, 25400354

Aperiodic long-range order in decagonal quasicrystals with long-periodicity
Grants-in-Aid for Scientific Research
01 Apr. 2012 - 31 Mar. 2015
TAKAKURA Hiroyuki
In this project, experimental and theoretical investigations have been performed focusing on decagonal quasicrystals in order to make progress on the structure analysis of unsolved quasicrystals. Single crystals of an approximant crystal to decagonal quasicrystals in the Al-Pd-Ru system have been grown successfully. Average structure of the Zn-Mg-Dy decagonal quasicrystal has been determined by means of five-dimensional structure analysis. A feasible five-dimensional structure model for an Al-Cu-Rh decagonal quasicrystal was constructed. Multiple diffraction phenomena in an Al-Cu-Ru icosahedral quasicrystal have been evaluated by using an originally developed simulation code, which is based on the kinematical theory for X-ray diffraction.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 24560002

Atomic bonding nature in aperiodic long-range ordered structures
Grants-in-Aid for Scientific Research
2009 - 2011
TAKAKURA Hiroyuki; ISHIMASA TSUTOMU; KASHIMOTO Shiro; TSI An pang; YAMAMOTO Akiji
To give the basis of the aperiodic-crystal engineering, for quasicrystals and related approximant crystals, single crystal growths and crystal structure analyses have been attempted in several alloy systems. Single crystals, with a typical size of several millimeters of a decagonal phase with 1.6 nm periodicity and approximant crystals in the Al-Ni-Ru system were grown successfully by the flux method. Single crystals of a higher-order, 3/2-2/1, approximant to a decagonal phase with 1.2 nm periodicity have also been grown successfully. The flux method makes possible to grow single crystals of Al-based quasicrystals, which contain high-melting-point metal as constituent elements, at relatively low-temperatures.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 21560003

Panoscopic structural properties and physical properties in quasicrystals containing rare-earth metals
Grants-in-Aid for Scientific Research
2008 - 2008
ISHIMASA Tsutomu; TAKAKURA Hiroyuki; KASHIMOTO Shiro
パノスコピックな構造秩序の一例である準結晶を取り上げてその構造と物性を研究した。Cu-Al-Sc合金において準結晶から2種類の近似結晶への相分離を見いだした。この相分離では、前駆現象として、変調型準結晶が生じる。また、Cu-Al-Sc 1/1近似結晶の粉末X線構造解析を行ってTsai型クラスターの原子配置を明らかにした。さらに、2種類の磁性元素を含むZn-Fe-(Sc, Tm)準結晶について磁気測定を行って、7～10Kの凍結温度をもつスピングラスの存在を明らかにした。
Japan Society for the Promotion of Science, Hokkaido University, 20900102

希土類合金準結晶におけるパノスコピック構造制御とその物性研究
科学研究費助成事業
2007 - 2008
石政 勉; 高倉 洋礼; 柏本 史郎
パノスコピックな階層秩序を特徴とする準結晶、その初項に対応する周期構造である近似結晶を研究対象として以下の成果をあげた。1.Cu-Al-Sc合金において正20面体準結晶、1/1近似結晶、および2/1 1/1 1/1近似結晶を発見し、その形成条件を調べた。この合金では準結晶は準安定相であり、2種の近似結晶が安定相であることが判明した。2.階層秩序の初項にあたるクラスターの構造を調べるため、Zn-Sc1/1近似結晶(低温相)のX線構造解析を行った。その結果、クラスターは、第1殻:Zn正12面体、第2殻:Sc正20面体、第3殻:Znのicosidodecahedronから構成されている事を確認した。Znの正4面体が内部に含まれているので、第1殻は著しく歪んでいる。第1、2、3殻相互の結合においては最密パッキングの原則が守られているのに対して、4面体と第1核間の結合様式は異なる点が興味深い。3.Feが磁気モーメントを持つ安定正20面体準結晶Zn-Fe-Scの低温磁気秩序について、磁化測定と中性子散乱を用いて調べた。この準結晶では凍結温度7Kのスピングラス相が生じた。それに対応して、磁気回折にはBragg反射は生じず、単範囲秩序を反映した磁気散漫が観測された。さらに、Scを半分程度希土類元素HoまたはTmで置換した準結晶についても同様の実験を行ったが、長距離磁気秩序は出現しなかった。
日本学術振興会, 特定領域研究, 北海道大学, 19018002

準結晶における希土類金属の自己相以的階層構造の実現とその物性研究
科学研究費助成事業
2005 - 2006
石政 勉; 高倉 洋礼; 柏本 史郎
1.Cu基3元合金準結晶の発見
Cu_<48>Ga_<34>Sc_<18>及びCU_<46>Al_<38>SC_<16>合金において正20面体準結晶を発見した。これらの準結晶は黄金比τの3乗のスケーリング則を示し、P型に属する。また、構成元素や組成比からTsai型クラスターを含むものと推定された。前者の形成には、液体急冷法の適用が必要であった。それに対して、後者の場合は、アーク炉での溶融と冷却で準結晶が形成され、さらに600℃での時効処理後も観察されたので、安定相の可能性も含めて形成条件の詳細を研究中である。
2.Zn-Sc低温相近似結晶のX線構造解析
Zn_<85.5>Sc_<14.5>の組成をもち、良く焼鈍された1/1近似結晶は、電気抵抗の異常を伴って153Kで低温相に転移する。この低温相の構造を、92K付近での電子線回折と粉末X線回折実験によって解析した。低温相は、高温相BCCの2倍の体積の格子を持つ単斜晶で、空間群はC2/cであった。低温相では、4個のZnから成る正4面体を含んで歪をともなったTsai型クラスターが基本構造となっていた。また、このようなクラスターがC面心とc-glideに従って規則的に配置しているととが判明した。これは、近似結晶低温相においてクラスター内部の構造が観察された初めての結果である。同様の正4面体を含んだ原子クラスターは、準結晶においても存在するものと想像され、自己相似的秩序の「初項」に関する情報を得たという点で重要である。
3.Feとランタノイドの両方を含む安定準結晶:形成条件と磁性
Zn_<77>Fe_<7>Sc_<16-x>L_x(L=Ho, Er, Tm)の組成を持つP型正20面体準結晶をほぼ0≦x≦8の領域で見いだした。これらの準結晶は、すくなくとも700℃付近において安定であり、徐冷法によりmmサイズの正12面体形状の単準結晶が形成されることもあった。これらの準結晶においては、ランタノイドだけでなくFe原子も磁性に寄与していることを磁気測定の結果は示していた。また、Tmの場合、凍結温度9Kを持つスピングラス特性を示した。これらの準結晶においては、2種類の磁性元素が準周期的に配置しているはずであり、今後の構造解析が待たれる。
日本学術振興会, 特定領域研究, 北海道大学, 17042001

Order and Disorder in Novel Condensed Phases Formed at Interfaces
Grants-in-Aid for Scientific Research
2004 - 2006
INABA Akira; NAGANO Yatsuhisa; MIYAZAKI Yuji; SAKISATO Naoki
The goal of this research project was to understand the "Order and Disorder, or Complexity" created in various novel "2-D Solids" formed at interfaces. It has been investigated from both the structural and thermodynamic aspects. Three types of condensed phases have been studied; (a) 2-D solids formed at gas-solid interfaces, (b) 2-D solids formed at solid-liquid interfaces, and (c) 2-D ice crystals formed during the initial crystallization process. We applied scanning probe microscope as well as calorimetry and X-ray and neutron diffraction techniques. The followings are the results obtained in this year.
1.With scanning probe microscope, we tried to observe the structure of a couple of liquid-crystalline materials adsorbed on the surface of graphite (and mica) under a vacuum at the temperature ranging from 150 K to 400 K. While we met various problems in obtaining the real feature, this technique certainly became one of our powerful methods to study those systems.
2.X-ray and neutron diffraction techniques have been continuously applied to those systems successfully. We- published a paper on this. As an extension of this research, we have started another project to see the structure of perfluoroalkane monolayers adsorbed on graphite.
3.For the glycerol/water system, we published one paper and continue to study the thermodynamic feature at very low temperature down to 0.4 K. The crystallization of cubic ice and hexagonal ice from the mixture is going to be very interesting, which may be very important also from the practical point of view.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Osaka University, 16205001

1. structure determination method of aperiodic crystals 2. structure analysis of aperiodic crystals
The Other Research Programs
Competitive research funding

非周期結晶の構造解析法の研究と構造解析
その他の研究制度
Competitive research funding