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金刚石结构Si的相互作用势函数的优化与缺陷运动模拟

Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2008-08-15

Journal: 材料导报

Included Journals: CSCD、ISTIC、PKU

Volume: 22

Issue: 8

Page Number: 123-126

ISSN: 1005-023X

Key Words: 分子动力学;相互作用势;空位

Abstract: 采用Stillinger-Weber相互作用势能对原子体系的内聚能进行计算,但根据目前已知的参数,通过GULP软件模拟得到的部分金刚石结构材料的某些性质与实验值相差较大.针对上述情况,以金刚石结构Si为研究对象,运用GULP软件对Si的SW势函数参数进行修正,并计算了优化后Si的内聚能、晶格常数、体积模量和弹性常数等参数,结果与实验值很符合;以此为基础,采用分子动力学方法,模拟了金刚石结构Si晶体中空位运动过程的能量变化,并对空位运动的方向和势垒进行了分析和讨论.

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