强电场作用下反铁电锆钛酸铅的介电行为研究

采用电滞回线方法和偏置直流电场中叠加小交变电场方法研究了锆钛酸铅反铁电陶瓷材料在强电场作用下的介电行为.测量结果显示，锆钛酸铅反铁电材料的介电常数随外加电场强度呈非线性变化，在反铁电 铁电转变的电场区间形成介电峰.表征极化强度随电场强度变化率的微分介电常数εd峰值出现在反铁电 铁电转换电场强度处，最高达到41000.随着偏置电场增加反铁电向铁电体转变过程中，小信号介电常数εc减小；在电场降低铁电回复成反铁电过程中，小信号介电常数εc增大，小信号介电常数εc峰先于微分介电常数εd峰出现.根据电场作用下反铁电 关键词： 锆钛酸铅反铁电陶瓷 介电行为 强电场条件

Dielectric behaviour of antiferroelectric lead zirconate titanateunder strong electric field

The dielectric behaviour of antiferroelectric lead zirconate titanate has been studied by measuring the polarization and capacitance changes with the electric field.The results show that the differential dielectric constant　εd calculated from the polarization versus electric field curve exhibits sharp peaks at the electric fields that switch an antiferroelectrics ferroelectrics transition,and the maximum value of εd can reach up to 41000. The small signal dielectric constant εc measured will decrease rapidly during the phase transition from an antiferroelectric state to a polarized ferroelectric state by increasing the dc bias field, and εc　will increase during the ferroelectric state returns to the original antiferroelectric state by reducing dc bias field. It is noticed that the extreme values of the differential dielectric constant εd are electric hysteretic to the extreme of the small signal dielectric constant εc. These phenomena are analyzed by using the electric domain evolution under an electric field.