Ba1-xSrxTi0.88Sn0.12O3陶瓷结构与介电性能的研究

采用高温固相烧结法制备了Ba1-xSrxTi0.88Sn0.12O3(x=0.10,0.20,0.30,0.40,0.50)陶瓷,研究了Sr含量及烧结温度对Ba1-xSrxTi0.88Sn0.12O3陶瓷结构与介电性能的影响.XRD初步分析表明Ba1-xSrxTi0.88Sn0.12O3陶瓷在室温为立方钙钛矿结构.进一步的研究表明Ba1-xSrxTi0.88Sn0.12O3陶瓷的介电性能与对A位、B位进行的离子取代密切相关.随着Sr含量的增加,不同烧结温度下Ba1-xSrxTi0.88Sn0.12O3陶瓷的介电性能下降,相变温度Tc移向低温.尽管在所研究的组分范围内Ba1-xSrxTi0.88Sn0.12O3表现出扩散相变铁电体的特征,但是典型的介电弛豫行为并没有被观察到.

Microstructure and Dielectric Properties of Ba1-xSrxTi0.88Sn0.12O3 Ferroelectric Ceramics

Effects of Sr concentration and sintering temperature on microstructure and dielectric properties of Ba_(1-x)Sr_xTi_(0.88)Sn_(0.12)O_3(x=0.10,0.20,0.30,0.40 and 0.50)ceramics prepared by a high temperature solid-state technique were investigated.A preliminary structural XRD analysis of these compounds shows the formation of cubic perovskite structure.Detailed studies show that the dielectric properties of these compounds are closely related to Sr~(2+) and Sn~(4+) ions substituting for A-and B-site in Ba_(1-x)Sr_xTi_(0.88)Sn_(0.12)O_3 solid solutions ceramics.The dielectric properties of Ba_(1-x)Sr_xTi_(0.88)Sn_(0.12)O_3 ceramics decrease and the temperature of the maximum dielectric constant T_c shifts to lower temperature with increasing x values.A typical relaxation behavior is not observed,though all studied compositions exhibit the broad diffused phase transitions.