The lattice dimensions of the AB2 Laves phases
The lattice dimensions of the AB2 Laves phases
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AB2 Laves 相的晶格尺寸
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
A. Edwards
中科院分区：
文献类型：
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作者：
A. Edwards
提出了一个几何/化学联合模型来解释观察到的立方AB2Laves相的晶格尺寸。这些化合物被认为是简单的金属bcc和fcc结构之间的杂化结构，原子间距取决于纯A和B金属的原子直径及其电负性的差异。该模型的成功足以表明，电负性概念可以在合金化学中找到比过去更广泛的定量应用。所采用的处理还导致了对立方和六方Laves相的相对出现频率、这些化合物中同素异构性的发生率、某些明显有利的合金系统中不出现Laves相的定性解释，以及在显示出一定范围的均质性的相中发现的最低A-金属含量。
A combined geometric/chemical model is proposed to account for the observed lattice dimensions of the cubic AB2 Laves phases. These compounds are treated as a hybrid structure between the simple metallic bcc and fcc structures, the interatomic spacings depending on the atomic diameters of the pure A and B metals and on the difference in their electronegativities. The model is successful enough to indicate that the electronegativity concept could well find wider quantitative applications in alloy chemistry than it has in the past. The treatment used also leads to qualitative explanations for the relative frequency of occurrence of cubic and hexagonal Laves phases, the incidence of allotropy in these compounds, the nonappearance of Laves phases in certain apparently favorable alloy systems, and the minimum A-metal content found in phases showing a range of homogeneity.