A two-dimensional structure map for prediction of the transition-metal Laves phases

A two-dimensional structure map for prediction of the transition-metal Laves phases
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用于预测过渡金属拉夫斯相的二维结构图

DOI:
10.1016/j.commatsci.2016.08.023
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发表时间:
2016-12
影响因子:
3.3
通讯作者:
Zhiping Luo
Zhiping Luo
中科院分区:
材料科学3区
文献类型:
--
作者:
Yong Xian;Hongxing Zheng;Qijie Zhai;Zhiping Luo

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虽然人们普遍认为原子尺寸和电子因素控制过渡金属(TM) Laves相的形成,但缺乏对TM-TM Laves相发生的几何描述。本文提出了以原子半径比(R)和电子总数(DET)为坐标的二维结构图来预测Laves相,并利用detis来描述TM-TM Laves相的成键特征。在结构图中,发现TM-TM Laves相通过液相合金形成16个配位的Frank-Kasper多面体的判据r > 1.116;而5 <DET< 10的变窄范围可以提供TM-TM体系中不饱和共价键形成趋势的经验测量。本文定义的通过液态合金形成的TM-TM Laves相的存在性同时满足r > 1.116和5 <DET< 10。所提出的二维结构图方法为预测TM-TM体系中的Laves相提供了一种可能的新策略。
Although it is well accepted that atomic size and electronic factors control the formation of transition-metal (TM) Laves phases, a geometrical description of the occurrence of the TM-TM Laves phases is lacking. In this paper, a two-dimensional structure map is proposed to predict the Laves phases using atomic radius ratio (R) andd-electron total count (DET) as coordinates, whereDETis empirically developed to describe the bonding features in the TM-TM Laves phases. Within the structure map, the criterionR> 1.116 is found for the formation of 16-coordinated Frank-Kasper polyhedra in TM-TM Laves phases through liquid alloys; while the narrowed range of 5 <DET< 10 may offer an empirical measurement on the formation tendency of unsaturated covalent bonds in the TM-TM systems. The existence of TM-TM Laves phases forming through liquid alloys defined in the present work satisfies bothR> 1.116 and 5 <DET< 10 simultaneously. The proposed two-dimensional structure map method provides a possible new strategy to predict the Laves phases in the TM-TM systems.
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