施受主共掺杂对BaTiO_3陶瓷介电性能的影响  

Dielectric Properties of Donors and Acceptors-doped Barium Titanate Ceramics

作　　者：刘国标[1] 丁士华[1] 李胜[1] 罗光华[1] 宋天秀[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《压电与声光》2008年第1期78-81,共4页Piezoelectrics & Acoustooptics

基　　金：四川省教育厅科技基金资助项目(2006C025);西华大学人才基金资助项目(R0620109)

摘　　要：通过传统的球磨工艺,分别以MnCO3、Co2O3为受主杂质,La2O3、Nb2O5、Bi2(SnO3)3为施主杂质对BaTiO3陶瓷进行掺杂。实验表明,BaTiO3陶瓷介电性能跟施主杂质与受主杂质的比例有关。当施主杂质与受主杂质的比例较大时,介电常数-温度(-εT)曲线趋于平缓,BaTiO3陶瓷呈强铁电弥散性,介电损耗-温度(tan-δT)曲线趋于平滑,介电损耗-频率(tan-δf)曲线呈松弛极化损耗特性。当施主杂质与受主杂质的比例较小时,-εT曲线出现较大的居里峰值,BaTiO3陶瓷呈普通铁电体的性质,tan-δT曲线也出现较大峰值,tan-δf曲线表现为电导损耗特征。BaTiO3陶瓷晶粒的"核-壳结构"模型能较好地解释这一现象。BaTiO3 ceramics were prepared by conventional solid state processing with MnCO3 and Co2O3 doped as acceptor, La2O3, Nb2O5 and Bi2（SnO3）3 doped as donors. The results showed that the dielectric properties of BaTiO3 ceramics were related with the ratio of donors and acceptors. The curves of permittivity and dielectric loss as function of temperature were flat and showed ferroelectric relaxor characteristics when the content of donors exceed that of acceptors. While the content of acceptors exceed donors, the permittivity and dielectric loss peak of BaTiO3 ceramics appeared at curie temperature. BaTiO3 ceramics showed general ferroelectric behavior and the characteristics of electrical conductivity loss. The model of core-shell of BaTiO3 ceramics was used to explain the phenomena.

关 键 词：施主杂质 受主杂质 铁电弥散性 

分 类 号：TM28[一般工业技术—材料科学与工程]