Mn掺杂的SnO_2·ZnO·Nb_2O_5压敏材料

SnO_2·ZnO·Nb_2O_5 Varistors Doped with Mn

研究了MnCO3掺杂对SnO2-ZnO-Nb2O5压敏材料压敏-介电性能的影响,研究中发现,掺入x(MnCO3)为0.08%的样品显示出最高的非线性系数(α=8.2),最高的势垒高度(φB=1.11eV),最高的击穿电场(E=466.67V/mm)。研究中同时发现,SnO2-ZnO-Nb2O5压敏材料的相对介电常数在573～673K间出现峰值,峰值随MnCO3掺入量的增加而增大,掺入x(MnCO3)为0.3%的样品在593K时,显示出最高的相对介电常数(εr=1.886×104)。

Investigations have carried out concerning the influence of the addition of MnCO3 on the nonlinear electrical properties of SnO2ZnONb2O5 varistor system.It is found that the sample with x(MnCO3) 008% presents the highest nonlinear coefficient(α=82),the highest potential barrier height(φB=111 eV),and the highest breakdown electric field (E10=4668 V/mm).It is also found there exist a peak value in the dielectricstemperature spectrum of a SnO2ZnONb2O5 varistor,the peak value rises along with the increase of the MnCO3 concentration,and the varistor with 03% MnCO3 exhibits the highest dielectric constant(εr=189×104)at 593 K.In order to illustrate the nonlinear electrical behaviour of the SnO2ZnONb2O5 varistors,a grain defect barrier model was introduced.