DFT study on ferroelectricity of BaTiO3

被引:82
作者
Chen, ZX
Chen, Y
Jiang, YS [1 ]
机构
[1] Nanjing Univ, Lab Mesostructured Mat Chem, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Chem, Nanjing 210093, Peoples R China
关键词
D O I
10.1021/jp0032558
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The ferroelectricity of BaTiO3 is investigated with the plane-wave pseudopotential method and the LCAO quantum chemical approach in the framework of density functional theory (DFT). Potential energy surfaces of various atomic displacements and the influence of lattice strain and lattice volume on the surfaces are examined. On the basis of the potential surfaces, phonon frequencies are also computed, which me in agreement with experiment results. The obtained potential energy surfaces show that the ferroelectric phase transition (from the cubic to the tetragonal phase) is decisively controlled by Ti displacement, The larger the lattice volume and the ratio c/a, the deeper the potential well. The calculated electronic populations and static charges show that from cubic to tetragonal phases Ti and O1 lose charges whereas Pa and O2 gain charges. The bond orders reveal that Ba-O has some extent of covalency, and during the phase transition the chemical bonding between metal and oxygen atoms, especially the Ti-Ol bond, is enhanced. Our results seem consistent with the vibronic theory about the origin of ferroelectricity of BaTiO3.
引用
收藏
页码:5766 / 5771
页数:6
相关论文
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