DC conductivity of V2O5-PbO-TeO2 glasses and the effect of pressure

被引:22
|
作者
Sakata, H [1 ]
Amano, M [1 ]
Yagi, T [1 ]
机构
[1] UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN
关键词
D O I
10.1016/0022-3093(95)00478-5
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The dc conductivity of V2O5-PbO-TeO2 glasses was investigated from 300 to 473 K, and the effect of pressure on conductivity was studied to 6 GPa. Glasses were found to be n-type semiconductors with conductivity sigma = 1.5 X 10(-6)-1.2 X 10 S-4 cm(-1) at 408 K. The conduction was confirmed to be due to small polaron hopping between vanadium ions and was adiabatic for V2O5 = 40-70 mol%. The carrier density determined was 0.96-3.18 X 10(21) cm(-3). Estimated carrier mobility was from 8.61 X 10(-9) to 1.02 X 10(-7) cm(2) V-1 s(-1). The dominant factor determining conductivity was mobility in these glasses. The application of pressure to 6 GPa increased conductivity about a factor of 2-4. Reversible changes in conductivity on applying or releasing pressure were observed and attributed to variations in vanadium ion spacing, R, assuming small polaron hopping conduction in compacted glasses.
引用
收藏
页码:198 / 206
页数:9
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