Tsai-Type Quasicrystal and Its Approximant in Au-Al-Tm Alloys

• Authors: K. Tanaka , Y. Tanaka , T. Ishimasa , M. Nakayama , S. Matsukawa , K. Deguchi , N. Sato
• Languages of publication: EN

Abstracts

EN

A P-type icosahedral quasicrystal with a six-dimensional lattice parameter a_{6D} = 7.411 Å is formed as an equilibrium phase in Au-Al-Tm alloy, of which composition was analyzed to be Au_{46}Al_{38}Tm_{16} by electron probe microanalysis. This quasicrystal is observed as a predominant phase in both as-cast and Au_{49}Al_{34}Tm_{17} alloys annealed at 910°C, and as one of main phases in the alloy slowly cooled from 1020°C. A 1/1 approximant, Au_{48}Al_{38}Tm_{14}, is also formed near the composition of the quasicrystal. This is a body-centered cubic structure (space group: Im3̅) with a lattice parameter a = 14.458 Å that is an isostructure to the recently reported 1/1 Tsai-type approximant in Au-Al-Yb. This approximant is characterized by disorderly arranged four Au-Al atoms centered at the Tsai-type cluster, presence of atoms at 8c site, and chemical ordering of Au and Al at sites forming a partial triacontahedron.

Keywords

EN

61.66.Dk; 61.44.Br

Discipline

• 61.44.Br: Quasicrystals
• 61.66.Dk: Alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 2
• Pages: 603-607

Dates

published

2014-08

Contributors

author

K. Tanaka

• Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan

author

Y. Tanaka

• Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan

author

T. Ishimasa

• Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan

author

M. Nakayama

• Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan

author

S. Matsukawa

• Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan

author

K. Deguchi

• Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan

author

N. Sato

• Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan

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Identifiers

DOI

10.12693/APhysPolA.126.603