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MgO高温高压特性及相变的第一性原理研究

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Indexed by: Journal Article

Date of Publication: 2009-02-28

Journal: 原子与分子物理学报

Included Journals: CSCD、ISTIC、PKU

Volume: 26

Issue: 1

Page Number: 57-62

ISSN: 1000-0364

Key Words: 第一性原理;方镁石;相变;高压

Abstract: 应用第一性原理密度泛函理论计算了MgO在零温(0K)下和0~200 GPa静水压范围内的晶体结构和弹性模量,以及B1、B4和B8相结构的MgO的声速随压力的变化.利用准简谐近似下的Debye模型,通过拟合三阶Birch-Murnaghan物态方程模拟了高温效应并对三个相在高温高压下的相稳定性做了研究.本工作的计算结果与前人的理论和实验结果符合较好,说明第一性原理结合准简谐Debye模型能够比较准确的模拟矿物如MgO在高温高压下的热力学性质.

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