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BaTiO3(111)极化面的几何结构及电子结构的理论研究
Theoretical investigation on the geometries and electronic structures of BaTiO3(111) polar surfaces
【摘要】 采用密度泛函理论对若干钛酸钡(111)表面的几何结构和电子态进行了研究。几何结构的数据表明,表面弛豫效应随着原子层数增加逐渐减弱,最后达到弛豫平衡。Mulliken电荷和态密度的计算结果则证实,表面缺陷的存在、表面氧原子的吸附以及表面电子态的变化都可以使表面原子的电荷发生变化,这对于极化表面极性补偿条件的实现是非常有利的。
【Abstract】 The geometries and electronic states of several BaTiO3(111) surfaces were investigated by density functional theory(DFT).The geometry data revealed that the surface relaxation effect is damped with increasing number of atomic layers,and the relaxation equilibrium is established finally.According to the Mulliken charges and density of states(DOSs),it can be confirmed that the surface atomic charges can be changed via surface defects,adsorption of surface atoms,and variations of surface electronic states,and these changes are very favorable for the fulfillment of the polarity compensation condition for polar surfaces.
【Key words】 density functional theory; perovskites; polar surface; electronic structures;
- 【文献出处】 黑龙江大学自然科学学报 ,Journal of Natural Science of Heilongjiang University , 编辑部邮箱 ,2012年06期
- 【分类号】O611.3
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