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arXiv 0709.2302cond-mat.mtrl-sci
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三元fcc溶液相特殊准随机结构的第一性原理研究

First-principles study of ternary fcc solution phases from special quasirandom structures

Dongwon Shin, Axel van de Walle, Yi Wang, Zi-Kui Liu

摘要:

在本工作中,三元特殊准随机结构(SQS)的fcc固溶体相产生在不同的组成,$x_A=x_B=x_C=\tfrac{1}{3}$和$x_A=\tfrac{1}{2}$,$x_B=x_C=\tfrac{1}{4}$,其关联函数是令人满意的接近那些随机fcc溶液。用生成的SQS计算了Ca-Sr-Yb系fcc相的混合焓。通过对Ca-Sr-Yb体系中所有二元和三元SQS的第一性原理计算发现,SQS的局域弛豫很小。这表明fcc结构三元固溶体相的混合行为可以提供有价值的信息。本文所建立的SQS模型可广泛应用于三元面心立方固溶体行为的研究。

英文摘要:

In the present work, ternary Special Quasirandom Structures (SQSs) for a fcc solid solution phase are generated at different compositions, $x_A=x_B=x_C=\tfrac{1}{3}$ and $x_A=\tfrac{1}{2}$, $x_B=x_C=\tfrac{1}{4}$, whose correlation functions are satisfactorily close to those of a random fcc solution. The generated SQSs are used to calculate the mixing enthalpy of the fcc phase in the Ca-Sr-Yb system. It is observed that first-principles calculations of all the binary and ternary SQSs in the Ca-Sr-Yb system exhibit very small local relaxation. It is concluded that the fcc ternary SQSs can provide valuable information about the mixing behavior of the fcc ternary solid solution phase. The SQSs presented in this work can be widely used to study the behavior of ternary fcc solid solutions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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