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.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
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)
