Nonlinear Electrical Behaviour of the TiO2·Y2O3·Nb2O5 System

• 来源期刊: 中国物理快报(英文版)
• 学科: 物理学
• 年，卷（期）: 2001,（5）
• 所属期刊栏目: ELECTRONIC STRUCTURE，ELECTRICAL，
• 页码范围: 674-676
• 页数: 3页
• 分类号: O4
• 语种: 英文

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 coeffcients of α = 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.l mol%)Nb2O5 composite sintered at 1400° C has a nonlinear coefficient of α = 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° 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.