【摘要】 本文研究了AlF₃-K₂NbOF₅系列玻璃导电性。通过对AlF₃-K₂NbOF₅系列玻璃的Raman光谱研究,初步确认了玻璃的结构。根据结构随组成的变化情况,进一步讨论了玻璃的电导率。 AlF₃-K₂NbOF₅二元系玻璃,当AlF₃的含量在21—29mol％范围内时,Al³⁺,Nb⁵⁺以八面体的结构形式存在,玻璃电导率随AlF₃含量的增加,出现极大值。当AlF₃的含量增大到29mol％时,玻璃中除有Al³⁺,Nb⁵⁺的八面体结构外,还有Al³⁺四面体结构存在,此时玻璃的电导率降低。我们认为Al³⁺四面体结构的出现有可能堵塞了玻璃中可动离子的迁移通道,致使玻璃的电导率降低。本系列玻璃的电导率在194℃时,σ=1.045×10^-2Q-1·cm^-1。更多还原

【Abstract】 In this paper, the ionic conduction in the glass system AlF₃-K₂NbOF₅ have been studied. The structure of glasses is also primarily established by Raman spectroscopy. The ionic conductivity of glasses is further discussed, based on the change of composition and structure.For glasses in system AlF₃-K₂NbOF₅, when A1F3 content ranges from 21-26 mol%, A13+ and Nb⁵⁺ ions are in octahedral coordination, and the ionic conductivity increases with increasing AlF₃ content. When A1F3 content reaches 29 mol%, A13+ ions are partly in tetrahedral coordination, and the ionic conductivity decreases. The effect is supposed to be caused by A1F₄-ion tetrahedron. Because of the appearance of A1F₄ ion tetrahedron, the mobile ion channels are possibly blocked. The ionic conductivity of glasses in this system is 1.045×10^-2Ω^-1·cm^-1.at 194℃.更多还原