Investigation on the piezo-ceramic discoloration during the DC electrical degradation process

The electrical degradation of piezoelectric ceramics occurs during the working process, whose features are decrease in resistance, increase leakage current, and formation discoloration areas. During process degradation, many times, occurrence breakdown events leads to production growth In this paper, high-voltage impact test is carried out obtained areas compared with It found that produced by same as those test, which shows grain arrangement disordered boundary fuzzy. phase structure two methods consistent ceramic matrix, it has been discovered a physical change process. caused local ceramics, light transmittance, direct cause. these will lead reduction dielectric loss but no effect on constant, capacitance, Curie temperature. resistance sample decreases load voltage.