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钙钛矿型铁电材料立方相价电子结构理论计算 被引量:2

Theoretical calculation of valence electron structure of cubic perovskite ferroelectrics
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摘要 应用固体与分子经验电子理论(EET)计算BaTiO3,BaZrO3,PbTiO3,PbZrO3,KNbO3,NaNbO3,CaTiO3,SrTiO38种典型立方相钙钛矿氧化物的价电子结构,并讨论晶体中各组成原子的实际价电子数。计算结果表明:8种钙钛矿氧化物的价键电子结构表现为离子性和共价性的混合,原子的种类是影响化合物价电子结构的重要因素,而相同的晶体结构决定了价电子分布的相似性;组成晶体的原子的实际价电子数与标准自由离子电荷有差异,且具有与玻恩有效电荷相似的特点。 The valence electron structures (VES) of eight types of cubic perovskite ferroelectrics were investigated by using the empirical electron theory(EET) of solids and molecules. The atomic charges in actual crystals were calculated. The results demonstrate that the VES revealed the co-existence of the ionic-covalent characters in the VES of perovskite compounds. In the crystal of perovskite compounds, the kind of atoms is the main factor of leading to the different electron structure. The same crystals structure determines the similarity of the valence electron distribution. The actual valence electron number is different from the nominal ionic charges. The actual valence electron number has the similarity to Born effective charges.
出处 《中国石油大学学报(自然科学版)》 EI CAS CSCD 北大核心 2009年第1期146-149,共4页 Journal of China University of Petroleum(Edition of Natural Science)
基金 国家自然科学基金项目(50371059) 国家自然科学基金国际合作项目(50510105109)
关键词 钙钛矿铁电体 电子结构 价键理论 perovskite ferroelectrics electron structure valence bond theory
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