期刊
JOURNAL OF APPLIED PHYSICS
卷 105, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3086628
关键词
Berry phase; bismuth compounds; bonds (chemical); density functional theory; dielectric polarisation; energy gap; semiconductor materials; zinc compounds
资金
- National Science Foundation of China [10572155, 10172030, 50232030]
- Hong Kong Special Administrative Region [PolyU 5171/07E]
- Hong Kong Polytechnic University [G-YF71]
We present first-principles investigations on the structural, electronic, and polarization properties of Bi2ZnTiO6 using density-functional theory within the generalized gradient approximation. The theoretical structure we obtained confirms the extra large tetragonality observed by experiment. The materials exhibit a semiconductor behavior with an indirect band gap determined by the occupied O 2p and unoccupied Bi 6p states. There are strong hybridization effects between Bi-O ions, as well as Ti-O and Zn-O ones. The resulting covalent bondings, having a PbTiO3-type two-dimensional character, strengthen each other and favor the coupling between the tetragonal distortion of unit cell and the off-center displacement of A and B-site cations and O anions due to the existence of Zn, and result in the large tetragonality of this compound. Berry-phase calculation gives the polarization as high as 122 mu C/cm(2).
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