Nonlinear electrical behaviour of the TiO2•Y2O3•Nb2O5 system

被引:14
作者
Li, CP [1 ]
Wang, JF [1 ]
Wang, YJ [1 ]
Su, WB [1 ]
Chen, HC [1 ]
Zhuang, DX [1 ]
机构
[1] Shandong Univ, Dept Phys, Jinan 250100, Peoples R China
关键词
D O I
10.1088/0256-307X/18/5/317
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The nonlinear and dielectric properties of a new TiO2-based varistor system, TiO2.Y2O3. Nb2O5, have been investigated. The (Nb, Y)-doped TiO2 ceramics have nonlinear coefficients of alpha = 5 - 8 and a lower breakdown electrical field of 6-12 V mm(-1), in which the varistor of (99.3mol%)TiO2 (0.6mol%)Y2O3 (0.1 mol%)Nb2O5 composite sintered at 1400 degrees C has a nonlinear coefficient of alpha = 7.8 and a maximum breakdown electrical field of 12 V.mm(-1) at 1 mA.cm(-2). Also, the relative dielectric constants of the composite reach more than 85 000, which is almost unchanged within the temperature range from -20 to 280 degrees C and the frequency range of 0.5 K-2 MHz. Due to these properties the (Nb, Y)-doped TiO2 varistor has varistor-capacitance bifunctional components, which are quite useful in the situation that the voltage protection and high-frequency noise absorption are meanwhile required.
引用
收藏
页码:674 / 676
页数:3
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