K-Pb-Tl-O复合氧化物的合成和电子结构的XPS研究

用熔盐阳极电沉积法合成了导电的复合氧化物K-Pb-Tl-O晶体.这些晶体具有纳米尺寸层状结构.用XPS对其进行了表征,并与相关的化合物进行了比较.实验表明,氧化物中的Pb和Tl都以高价态的单一价态存在,但电子结合能比相应的非导电低价化合物的低.该文用原子外弛豫效应解释了复合氧化物中的Pb和Tl的结合能的反常现象.讨论了它们的价电子结构与导电性的关系.

Synthesis of K Pb Tl O Complex Oxides and XPS Study on Their Electronic Structure

Crystals of K Pb Tl O complex oxides were electrodeposited on the anode from molten salts.The resulting crystals show multilayer structure with resolvable layer thicknesses in nonameters.XPS was used to analyze the crystals and the related compounds.The experimental results indicate that Pb and Tl in K Pb Tl O oxides are in single high valence states.However,their core level binding energies are lower than that of the corresponding low valence non conducting compounds.This abnormal phenomenon has been explained by using the extra atomic relaxation effect.In addition,the relationship between the valence electronic structure and the conductivity has been discussed.