The pseudocubic approximant Mg₅₁Zn₂₀ interpreted as a modulated crystal

Masaya Uchida Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan; Japan Science and Technology Corporation, Kawaguchi, Saitama, 332-0012, Japan

Yoshio Matsui Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan; Japan Science and Technology Corporation, Kawaguchi, Saitama, 332-0012, Japan

Abstract

The structure of the pseudocubic Mg₅₁Zn₂₀ phase, which is related to icosahedral quasicrystals, was interpreted as a modulated crystal. It basically comprises distorted close-packed layers with ordered atomic vacancies. The basic reciprocal-lattice vectors point to the vertices of a distorted icosahedron. A relationship in reciprocal space between the Mg₅₁Zn₂₀ phase and the icosahedral Zn-Mg-Dy quasicrystal was also investigated.

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The pseudocubic approximant Mg₅₁Zn₂₀ interpreted as a modulated crystal

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The pseudocubic approximant Mg₅₁Zn₂₀ interpreted as a modulated crystal