準結晶研究の最近の展開　　２．準結晶をつくる（準結晶の作製）新合金の準結晶：その構造と形成条件

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  • New Group of Quasicrystalline Alloys: its Structural Properties and Formation Conditions
  • シンゴウキン ノ ジュンケッショウ ソノ コウゾウ ト ケイセイ ジョウケン

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Recent progress on a new group of icosahedral quasicrystals is reviewed. This group is characterized by Tsai-type atomic cluster as a local structural unit, which is different from Mackay and Bergman-types. This group can be regarded as largest including two Cd-based binary, seven Zn-based and ten Cd-based ternary stable phases as well as Cu- and Ag-based phases. They are all P-type, and some of them exhibit higher degree of structural perfection than the “perfect” Al-Pd-Mn quasicrystal. In the Tsai-type quasicrystals, there are substitution rules in the constituent elements. Hume-Rothery rules, namely the equality in e/a and in the ratio of atomic radii, play important role in the substitution rules.

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