Abstract：The nonlinear properties and the 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 α =5-8 and a lower breakdown electrical field of 6-12V.mm-1, in which the varistor of (99.3mol%)TiO2.(0.6mol%)Y2O3.(0.1mol%)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 85000, 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 varistors has varistor capacitance bifunctional components, which are quite useful in the situation that the voltage protection and high frequency noise absorption are meanwhile required.
LI Chang-Peng;WANG Jin-Feng;WANG Yong-Jun;SU Wen-Bin;CHEN Hong-Cun;ZHUANG De-Xin. Nonlinear Electrical Behaviour of the TiO2.Y2O3.Nb2O5 System[J]. 中国物理快报, 2001, 18(5): 674-676.
LI Chang-Peng, WANG Jin-Feng, WANG Yong-Jun, SU Wen-Bin, CHEN Hong-Cun, ZHUANG De-Xin. Nonlinear Electrical Behaviour of the TiO2.Y2O3.Nb2O5 System. Chin. Phys. Lett., 2001, 18(5): 674-676.
2001, Vol. 18 
