Local atomic structure inheritance in Ag50Sn50 melt

Local atomic structure inheritance in Ag50Sn50 melt
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Ag50Sn50 熔体中的局部原子结构继承

DOI:
10.1063/1.4863125
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发表时间:
2014-01
影响因子:
3.2
通讯作者:
Chuncheng Yang
Chuncheng Yang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yanwen Bai;Xiufang Bian;Jingyu Qin;Lina Hu;Jianfei Yang;Kai Zhang;Xiaolin Zhao;Shuo Zhang;Yuying Huang;Chuncheng Yang

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采用高温X射线衍射和从头算分子动力学模拟方法,研究了Ag 50 Sn 50合金化过程中的局部结构遗传特征。Ag原子周围的配位数N-m在合金中与纯Ag熔体中相近(N-m近似为10),而在合金化过程中,Sn原子周围的局部结构发生了重排。Sn-Sn共价键被Ag-Sn化学键所取代,Sn周围的总配位数比纯Sn熔体中增加了约70%。在合金的电子结构的变化进行了研究,通过Ag和Sn的K-边X-射线吸收光谱,以及通过计算的偏态密度。我们认为,Ag_(50)Sn_(50)中局域结构遗传的主要机制是Sn的s-p去杂化以及Sn-s和Ag-d电子之间的相互作用。(C)2014 AIP Publishing LLC.
Local structure inheritance signatures were observed during the alloying process of the Ag50Sn50 melt, using high-temperature X-ray diffraction and ab initio molecular dynamics simulations. The coordination number N-m around Ag atom is similar in the alloy and in pure Ag melts (N-m similar to 10), while, during the alloying process, the local structure around Sn atoms rearranges. Sn-Sn covalent bonds were substituted by Ag-Sn chemical bonds, and the total coordination number around Sn increases by about 70% as compared with those in the pure Sn melt. Changes in the electronic structure of the alloy have been studied by Ag and Sn K-edge X-ray absorption spectroscopy, as well as by calculations of the partial density of states. We propose that a leading mechanism for local structure inheritance in Ag50Sn50 is due to s-p dehybridization of Sn and to the interplay between Sn-s and Ag-d electrons. (C) 2014 AIP Publishing LLC.
DOI: 10.1088/0953-8984/23/1/015902
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影响因子: --
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