氟化物助烧PMN-PT陶瓷的制备与性能  

Preparation and Properties on PMN-PT Ceramics with Fluoride Sintering Aids

作　　者：曹林洪[1] 姚熹[2] 徐卓[2] 毛懿伟[1] 陈峻江[1] 贾玉蓉[1] 

机构地区：[1]西南科技大学先进建筑材料四川省重点实验室,四川绵阳621010 [2]西安交通大学电子材料研究所,陕西西安710049

出　　处：《四川大学学报（工程科学版）》2007年第3期96-100,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(5047205210474077)

摘　　要：以铌铁矿预产物合成法制备氟化物（LiF、MgF2、CaF2）助烧0.68Pb（Mg1/3Nb2/3）O3-0.32PbTiO3弛豫铁电陶瓷。采用XRD和SEM分析陶瓷相组成和显微结构,并对介电和压电性能进行测试。结果表明,所有陶瓷样品均为纯钙钛矿相,没有检测到其它杂相;LiF和MgF2助烧PMN-PT陶瓷的晶粒较大（约3~4μm）,而纯PMNT陶瓷和CaF2助烧PMN-PT陶瓷的晶粒较小（约0.5~1μm）;LiF和MgF2的添加使陶瓷峰值介电常数增大,压电性能提高,相变弥散程度减小,而添加CaF2使其峰值介电常数减小,压电性能下降,相变弥散程度增大。Relaxor ferroelectric 0.68 Pb（ Mg1/3Nb2/3 ） 03 - 0.32 PbTiO3 ceramics with fluoride （ LiF,MgF2 ,CaF2 ） sintering aids were prepared by the columbite precursor method. The phase composition and microstructure of ceramic samples was investigated by X -ray diffraction （XRD） and scanning electron microscopy （SEM）, and the dielectric and piezoelectric properties were measured. The results showed that pure perovskite phase was obtained for all the specimens and no other phase was detected. The grain size is larger （ about 3 - 4 μm） for the PMN - PT ceramics with LiF and MgF2 sintering aids, but smaller （ approximately 0.5 - 1 μm） for the pure PMN - PT ceramics and that with CaF2 sintering aids. For the PMN -PT ceramics with LiF and MgF2 sintering aids, the maximum dielectric constants increase, the piezoelectric properties are improved and the diffusion phase transition become weak. But for the PMN - PT ceramics with CaF2 sintering aids, the maximum dielectric constants decrease, the piezoelectric properties deteriorate and the diffusion phase transition become strong.

关 键 词：PMN-PT陶瓷 铌铁矿预产物合成法 氟化物 介电与压电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]