计算物理 ›› 2011, Vol. 28 ›› Issue (1): 105-110.

• 研究论文 • 上一篇    下一篇

萤石结构TiO2热力学性质的第一性原理计算

胡燕飞1,2, 袁玉全1   

  1. 1. 四川理工学院理学院, 四川 自贡 643000;
    2. 四川大学原子与分子物理研究所, 四川 成都 6l0065
  • 收稿日期:2009-10-09 修回日期:2010-01-13 出版日期:2011-01-25 发布日期:2011-01-25
  • 作者简介:胡燕飞(1982-),女,四川自贡,讲师,博士生,主要从事材料在高温高压下的物理性质计算研究.

First-principles Calculation of Thermodynamic Properties of TiO2 Compound

HU Yanfei1,2, YUAN Yuquan1   

  1. 1. School of Science, Sichuan University of Science & Engineering, Zigong 643000, China;
    2. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
  • Received:2009-10-09 Revised:2010-01-13 Online:2011-01-25 Published:2011-01-25

摘要: 利用第一性原理平面波赝势密度泛函理论研究TiO2的结构,其零温零压下的晶格常数和常温下的体弹模量及其对压强的一阶导数的计算结果与实验值和其他理论计算结果相符.通过准谐德拜模型,获得了相对晶格常数、相对体积、体弹模量、热膨胀系数、热容与温度和压强的关系.

关键词: 密度泛函理论, 准谐德拜模型, 热力学性质

Abstract: By using first-principles plane-wave pseudopotential method of density functional theory,structures and thermodynamic properties of TiO2 are investigated.Calculated lattice parameters,bulk modulus,and the first order pressure derivative of bulk modulus are consistent with experimental result and theoretical analysis.In a quasi-harmonic Debye model,relative lattice parameters,relative volume,bulk modulus,thermal expansion,and heat capacity under different temperatures and pressures are successfully obtained.

Key words: density functional theory, quasi-harmonic Debye model, thermodynamics properties

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