ABO_3型稀土复合氧化物结构特征和导电性的研究

Studies on the Structure Characteristics and Conductivity of ABO 3-type Rare Earth Composite Oxides

用Ｘ－射线光电子能谱（ＸＰＳ）对钙钛矿型稀土复合氧化物ＬａＭＯ３（Ｍ＝Ｃｒ、Ｆｅ、Ｃｏ、Ｎｉ）的结构性质进行了表征，发现ＬａＭＯ３中金属离子Ｍ的ｄ电子具有程度不同的离域性，且随着Ｍ的不同，离域程度递变规律为ＬａＮｉＯ３＞ＬａＣｏＯ３＞ＬａＣｒＯ３＞ＬａＦｅＯ３，这与其导电性大小顺序相一致。

In this paper,the structure characteristics of perovskite-type rare earth composite oxides LaMO 3(M=Cr,Fe,Co,Ni)were studied by x-ray photoelectron spectroscopy(XPS).It was found that d electrons of transition metal ion (M) in LaMO 3 had delocalizability in varying degrees, and the order for delocalized degree with varying M is LaNiO 3>LaCoO 3>LaCrO 3>LaFeO 3,which corresponds to that of thier coductivities.