Pb(Zn1/3Nb2/3)O3-Ba(Zn1/3Nb2/3)O3铁电陶瓷结构与性能的研究

采用固相反应的方法系统地研究了BZN稳定PZN基陶瓷的相结构与介电性能.随着BZN含量的增加,PZN-BZN陶瓷中钙钛矿相的稳定性增强,居里温度近似呈线性下降,室温介电常数和介质损耗随也显著降低,最小值分别为380和0.002.为获得100%钙钛矿结构的PZN基陶瓷所需BZN的最小用量为8mol%～10mol%,当BZN的mol%超过15mol%时,PZN基陶瓷中钙钛矿相所占的百分比不再受烧结工艺的影响,基本保持100%.1kHz时Pb0.9Ba0.1Zn1/3Nb2/3O3陶瓷的最大介电常数Kmax=8680,tgδ=0.02,相应的居里温度Tm为24℃.

Studies of structural and properties of Pb ( Zn1/3Nb2/3)O3-Ba(Zn1/3Nb2/3)O3 ferroelectric ceramics

Phase structure and dielectric properties of barium zinc niobate (BZN) stabilizing lead zinc niobate based (PZN) ceramics prepared by the solid state reaction were systematically investigated in this work. With the addition of BZN, the stabilization of perovskite phase of PZN-BZN ceramics increase, but Curie temperature for different compositions PZN-BZN ceramics decrease linearly in the rough, room dielectric constants and dielectric losses (1kHz) also decrease remarkly, the minimum value is up to380 and 0.002, respectively. The minimum amount of BZN modifier needed is 8mol% ～10mol%for obtaining 100% perovskite structure PZN-BZN ceramics. When BZN content in PZN-BZN ceramics is more than 15mol%, the percentage of the perovskite phase is not limited by the conditions of sintering processing. Good dielectric properties were obtained for the composition of0.90PZN-0.10BZN: The maximum dielectric constant (εmax) and dielectric loss (tgδ) and is 8680 and 0. 027, respectively. Curie temperature is 24℃, Correspondingly.