摘要
实验研究了驰豫铁电单晶PMN-PT(67/33)分别在等静水压和定向应力的情况下,其介电性质的变化,分析了介电常数和介电损耗的变化趋势.结果表明,介电常数随静水压的增大缓慢增加,压力在10MPa内其相对变化小于2%,介质损耗均小于0.01;而在定向应力均匀增大的情况下,介电常数和介电损耗均出现峰值现象.
Single crystal PMN-0.33PT(abbreviated as PMNT)exhibits high piezoelectric coefficient(d_ 33 ～2500pC/N)and electromachanical coupling coefficient (k_ 33 ～94%),it has promising potential of ultrasonic transducer and actuator applications. The single crystals were investigated with focus on the stability of dielectric properties with hydrostatic pressure and directional pressure. It was demonstrated that the permittivity slowly increased with pressure augment, it s relative varietywas less than 2% within hydro...
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第S1期329-331,共3页
Journal of Sichuan University(Natural Science Edition)
基金
北京市传感器重点实验室开放课题资助项目(604039)
关键词
弛豫铁电单晶
介电常数
介电损耗
稳定性
single crystal
dielectric coefficient
dielectric loss
stability
