高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (3): 460.

• 研究论文 • 上一篇    下一篇

难熔固体MX(M=Sc,Ti,V;X=C,N,O)电子结构和力学性质的密度泛函研究

李俊篯, 章永凡   

  1. 福州大学化学系, 结构化学国家重点实验室, 福州 350002
  • 收稿日期:1999-11-24 出版日期:2001-03-24 发布日期:2001-03-24
  • 通讯作者: 李俊(1942年出生),男,教授,博士生导师,从事固体与表面电子结构的研究.
  • 基金资助:

    国家自然科学基金(批准号:29973006);结构化学国家重点实验室基金(批准号:990018)资助

A Density Functional Study on the Electronic Structures and Mechanic Property of MX (M=Sc, Ti, V; X=C, N, O) Solids

LI Jun-Qian, ZHANG Yong-Fan   

  1. State Key Laboratory of Structural Chemistry, Department of Chemistry, Fuzhou University, Fuzhou 350002, China
  • Received:1999-11-24 Online:2001-03-24 Published:2001-03-24

摘要: 采用密度泛函方法对MX(M=Sc,Ti,V;X=C,N,O)固体的体相电子结构和力学性质进行了系统研究.计算结果表明,对于金属原子相同的同一系列化合物,氮化物具有最大的体模量;进一步的研究可知,随着外界压力的增大,化合物由NaCl构型向CsCl构型转变由易到难的顺序依次是氧化物、氮化物和碳化物.本文还首次用密度泛函方法系统地计算了各化合物的能带结构和态密度,并对该类型化合物的导电性能进行了探讨.

关键词: 过渡金属碳化物、氮化物和氧化物, 密度泛函理论, 能带结构, 态密度, 体模量

Abstract: The electronic structures and mechanic properties of MX (M=Sc, Ti, V; X=C, N, O) solids are investigated by using density functional theory(DFT). The results show that the mononitrides have the greatest bulk modulus. Under high compression, the calculations indicate that all compounds will undergo a structural phase transition from NaCl to CsCl structure, and the transition volume decreases from MC→MN→MO. The band structures and density of states of each compound are also calculated by DFTmethod, and the conductivity of this class of compounds is discussed.

Key words: MX(M=Sc, Ti, V, X=C, N, O) compounds, Density functional theory, Energy band structure, Density of states, Bulk modulus

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