Li2O-Nb2O-SiO2系统非晶态离子导体的结构与电学性能

本文采用红外吸收光谱法、X射线散射法和EXAFS方法研究了LiO-Nb₂O-SiO₂系统非晶态离子导体的结构,认为Nb⁵⁺在非晶结构网络中主要是以NbO₆]形式存在。非晶结构随Nb₂O₅含量的多少而变化。低Nb₂O₅含量时,NbO₆]相互间以边相连,并与SiO₄]组成多元环后,形成非晶网络结构。高Nb₂O₅含量时,非晶网络结构主要是以角顶相连的NbO₆]所组成。根据电导测试结果,讨论了结构与电学性能的关系,认为Li₂O含量在0.45左右,Nb₂O₅,含量在0.3左右组成的非晶材料有最高的电导率。 关键词：

INVESTIGATION ON THE STRUCTURE AND ELECTRIAL PROPERTIES OF THE NON-CRYSTALLINE IONIC CONDUCTORS IN THE Li2O-Nb2O5-SiO2 SYSTEM

IR, WAXS and EXAFS arn used to study the structure of the non-crystalline io nic conductors in the Li₂O-Nb₂O₅-SiO₂ system. From the analysis, it is known that Nb⁵⁺ ions exist mainly as (NbO₆) in the non-crystalline network. The non-crystalline structure varies with Nb₂O₅ content, it consists of polycyclics formed by shared side (NbO₆) and (SiO₄) when Nb₂O₅ content is. low, and shared of apex (NbO₆) when Nb₂O₅ content is higher. The results of conductivity measurement are used to study the relations of the structure and electrial properties. The non-crystalline material with about Li₂O 0.45 and Nb₂O₅ 0.3 has the highest conductivity.