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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-Nb_2O-SiO_2系统非晶态离子导体的结构,认为Nb~(5+)在非晶结构网络中主要是以[NbO_6]形式存在。非晶结构随Nb_2O_5含量的多少而变化。低Nb_2O_5含量时,[NbO_6]相互间以边相连,并与[SiO_4]组成多元环后,形成非晶网络结构。高Nb_2O_5含量时,非晶网络结构主要是以角顶相连的[NbO_6]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Li_2O含量在0.45左右,Nb_2O_5,含量在0.3左右组成的非晶材料有最高的电导率。
In this paper, the structure of amorphous ion conductor in LiO-Nb 2 O-SiO 2 system has been studied by means of infrared absorption spectroscopy, X-ray scattering and EXAFS. It is considered that Nb 5+ in the amorphous network mainly consists of [NbO 6] exist. The amorphous structure changes with the amount of Nb 2 O 5. When the content of Nb2O5 is low, [NbO_6] are connected to each other by edges and form a multi-membered ring with [SiO_4] to form an amorphous network structure. When the content of Nb2O5 is high, the structure of amorphous network is mainly composed of [NbO_6] linked at the corner. According to the results of the conductance test, the relationship between structure and electrical properties was discussed. It is believed that amorphous materials with a Li2O content of about 0.45 and a Nb2O5 content of about 0.3 have the highest conductivity.