【摘要】 采用耗尽层近似理论,分析了低压TiO2系压敏陶瓷在直流偏压下的伏安特性,并对ZnO、TiO2和SrTiO3系三种压敏陶瓷的伏安特性进行了测试、分析和比较。结果表明,在晶界势垒不太高(一般为零点几电子伏)及晶界电场强度不太大(约106V/m量级)的情况下,TiO2系压敏陶瓷晶界的电子传输机制不同于ZnO系压敏陶瓷,而与SrTiO3系压敏陶瓷的导电机制相似,属于肖特基热电子发射机制。更多还原

【Abstract】 The voltage current characteristic of TiO2 system varistor ceramics at DC bias voltage was analyzed by depletion layer approximation theory.By comparing and analyzing the similarities and differences of the measured V-I curves of ZnO,TiO2 and SrTiO3 system varistors,the mechanism of electron transmission through grain boundary of TiO2 system varistor ceramics was proposed.It shows that,at low energy barrier height and small grain boundary electric field strength,the electron transmission mechanism through TiO2 grain boundary is the thermionic emission in Schottky barrier,which is similar to that of SrTiO3 system varistor ceramics and is different from that of ZnO system varistor ceramics.更多还原