Single Vacancies and Vacancy Pairs in Tetragonal BaTiO3: A First Principles Study

Single Vacancies and Vacancy Pairs in Tetragonal BaTiO3: A First Principles Study
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四方 BaTiO3 中的单空位和空位对:第一原理研究

DOI:
10.1080/00150191003670374
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发表时间:
2010-10
期刊:
Ferroelctrics
影响因子:
--
通讯作者:
Yichun Zhou
Yichun Zhou
中科院分区:
其他
文献类型:
--
作者:
Bainian Liu;Ying Ma;Jianwen Ding;Yichun Zhou

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用第一性原理计算方法研究了四边形BaTiO3中单空位和空位对的形成能。结果表明,在还原电导作用下,氧空位在单个空位中具有最低的形成能。对于空位对,在大多数热力学条件下,Ba-O对的形成能低于Ti-O对。对含有Ba-O空位对的体系的极化计算表明,随着Ba-O空位对电偶极子方向的不同,其极化程度有增强或减弱的趋势,这可能与铁电材料的压印行为有关。
The formation energies of single vacancies and vacancy pairs in the tetragonal BaTiO3 were studied using first principles computational method. The results show that under reduction conductions, oxygen vacancies have the lowest formation energy among single vacancies. For vacancy pairs, the formation energies of the Ba-O pair are lower than that of Ti-O under most thermodynamical conditions. Calculation of the polarization for system containing Ba-O vacancy pairs shows that depending on the direction of the electric dipole of the pair, the polarization is either enhanced or decreased, which may be related to the imprint behavior of ferroelectric materials.
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