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Ti原子位置对立方SrTiO3电子结构的影响
引用本文:张文蕾,马梅,张丽英,张丽丽,曹庆琪.Ti原子位置对立方SrTiO3电子结构的影响[J].伊犁师范学院学报(自然科学版),2014(2):45-49.
作者姓名:张文蕾  马梅  张丽英  张丽丽  曹庆琪
作者单位:[1]伊犁师范学院物理科学与技术学院,新疆凝聚态相变与微结构实验室,新疆伊宁835000 [2]南京大学物理学院,国家固体微结构重点实验室,江苏南京210093
基金项目:本文由伊犁师范学院一般项目《铁电陶瓷材料掺杂的电子结构研究》(2013YLSYB162013);新疆凝聚态相变与微结构实验室开放课题《钙钛矿铁电功能材料的计算机模拟研究》(XJDX0912-2012-042012);新疆凝聚态物理重点学科专项经费开放课题《钙钛矿型铁电体的计算机模拟研究》(2012ZDXK31);伊犁师范学院一般项目《B位原子位置对立方钙钛矿材料电子结构的影响》资助.
摘    要:基于第一性原理密度泛函理论框架下的平面波超软赝势计算方法,计算分析了Ti原子Z轴分数坐标的移动对立方SrTiO 3的能带结构、能态密度和Mulliken电荷布居方面的电子结构的影响。计算结果表明,随着Ti原子Z坐标的上移,O原子的电子逐渐转移到Ti原子上,使得O的部分电子能量升高,Ti的部分电子能量降低,价带与导带渐渐重叠,能隙消失,即Ti原子位置可以强烈影响SrTiO 3的电子结构。

关 键 词:第一性原理  SrTiO  3  Ti原子位置  电子结构  SrTiO3

Effects of Ti Atomic Location on the Electronic Structure of Cubic SrTiO3
ZHANG Wen-lei,MA Mei,ZHANG Li-ying,ZHANG Li-li,CAO Qing-qi.Effects of Ti Atomic Location on the Electronic Structure of Cubic SrTiO3[J].Journal of Ili Normal University,2014(2):45-49.
Authors:ZHANG Wen-lei  MA Mei  ZHANG Li-ying  ZHANG Li-li  CAO Qing-qi
Institution:1.Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics, College of Physical Science and Technology, lili Normal University, lining, Xinjiang 835000, China; 2. School of Physics, National Lab of Solid State Microstructures, Nanjing University, Nanjing, Jiangsu 210093, China)
Abstract:We calculated three models of cubic SrTiO3 by first-principles based upon the density function theory (DFT). With Ti atoms moving along the fractional coordinates of Z axis,the electronic structure which are the energy band,density of states and Milliken charge population of cubic SrTiO3 are influenced. The calculation results show that,with the Ti atomic moving coordinates Z,the electrons of O atom gradually are transferred to Ti atoms,which made the partial electronic energy of O increase,partial electronic energy of Ti decrease,of the valence and conduction bands overlap,and band gap disappear. Or in other words,Ti atom could strongly influence the electronic structure of SrTiO3.
Keywords:first-principle  the location of Ti atomic  the electronic structure
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