金镉4：一种休姆-罗瑟里相，其价电子浓度为1.8，以二十面体和三方棱柱簇为结构单元。
AuCd4: a Hume-Rothery Phase with VEC of 1.8 and icosahedral and trigonal-prismatic clusters as building blocks.
作者信息
Jana Partha P, Lidin Sven
机构信息
CAS Chemical Centre, Lund University , Box 124, Getingevägen 60, Lund SE-22100, Sweden.
出版信息
Inorg Chem. 2015 Feb 2;54(3):713-21. doi: 10.1021/ic500616t. Epub 2014 Jun 17.
The η phase in the Au-Cd binary system has been synthesized, and the structure has been analyzed by single-crystal X-ray diffraction. The compound η-AuCd(4) crystallizes in the hexagonal space group P6(3)/m (No. 176). The unit cell contains ∼273 atoms. The compound AuCd(4) represents a √3a × √3a × c superstructure of the AgMg(4) type. The structure can be well described by icosahedral and trigonal-prismatic clusters. A phase transition to the high-temperature ε phase occurs exothermically at around 578 K. The compound is formed at a sharp valence electron concentration of 1.8 e/a. The compound can be understood within the framework of the Hume-Rothery stabilization mechanism.
已合成了金 - 镉二元体系中的η相，并通过单晶X射线衍射分析了其结构。化合物η - AuCd₄属于六方空间群P6₃/m（编号176）。晶胞包含约273个原子。化合物AuCd₄代表AgMg₄型的√3a×√3a×c超结构。该结构可用二十面体和三角棱柱簇很好地描述。在约578 K时会放热发生向高温ε相的相变。该化合物在价电子浓度为1.8 e/a时形成。该化合物可在休姆 - 罗瑟里稳定机制的框架内得到理解。
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