氟取代PMN-PT陶瓷的制备与性能研究  

Research on Preparation and Properties of Fluorine Substituted PMN-PT Ceramics

作　　者：曹林洪[1] 徐卓[2] 姚熹[2] 张瑞明[1] 李岩[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西安交通大学电子材料研究所,西安710049

出　　处：《材料工程》2007年第11期54-57,61,共5页Journal of Materials Engineering

基　　金：国家自然科学基金(50472052)资助项目

摘　　要：以PbF2为氟源,采用半化学法成功制备了钙钛矿相的F取代PMN-PT陶瓷。随F含量增加,陶瓷的体积密度增大。与含F试样相比,无F试样的晶粒较大,约10μm,介电常数峰和介电损耗峰都很尖锐,而且峰值介电常数异常高,约45000,其电滞回线矩形度高,剩余极化强度高,约30μC/cm^2,其压电常数较高,约420 pC/N;但在含F试样中,含摩尔分数2%F试样具有较好的显微结构、介电和压电性能。其晶粒约2～3μm,峰值介电常数约30000,剩余极化强度接近30μC/cm^2,压电常数约380 pC/N。The fluorine substituted PMN-PT ceramics with pure perovskite phase were prepared by semichemical method,and the fluorine came from the raw material PbF2.The density of these ceramics increased with the increase of fluorine contents.For the pure PMN-PT ceramic,the grain size is larger,approximately 10 μm,and the peaks of dielectric constants and dielectric loss are sharper,and the peak value of dielectric constant is abnormally high,about 45000,and the P-E hysteresis loop is more rectangular,and the remnant polarization is about 30 μC/cm^2,and the piezoelectric constant is about 420 pC/N.However,in the samples contained fluorine,the sample with 2 % mole fraction of F has better microstructure and dielectric and piezoelectric properties.The grains size is about 2-3 μm, and the peak value of dielectric constants is about 30000,and the remnant polarization is about 30 μC/cm^2,and the piezoelectric constant is about 380 pC/N.

关 键 词：PMN-PT陶瓷 氟取代 介电性能 压电性能 

分 类 号：O782[理学—晶体学]