锆钛酸钡陶瓷的制备与介电性能研究

Preparation and Study on dielectric properties of Ba(Zr_xTi_(1-x))O_3 ceramic

采用传统电子陶瓷工艺，制备了Ba（ZrxTi1-x）O3（BZT，x=0．20，0．25，0．30）铁电陶瓷，研究了不同Zr含量对陶瓷微观结构、介电性能和介电可调度的影响．结果表明，不同频率下陶瓷样品的介电温谱显示Ba（ZrxTi1-x）O3材料具有弥散相变的特征，当x=0．3时，已成为典型的弛豫型铁电体；温度为193～323K时，材料的介电可调度测量表明所有样品介电可调度均在10％以上，且在铁电态和居里温区附近介电可调度明显高于顺电态．从铁电畴、极性纳米微区的角度出发对实验结果进行了解释．发现室温（300K）时样品x=0．25的介电可调度可达49．5％，优化因子为49．11（1．5kV／mm，10kHz）．

Ba（ZrxTi1-x）O3（BZT,x=0.20,0.25,0.30） ceramics are prepared by using a traditional ceramic processing. The effects of the concentration of Zr on the microstructures, dielectric properties and tunability of BZT ceramics are investigated. The dielectric constants as a function of temperature at different frequencies show that the ceramics have characteristics of ferroelectrics with diffused phase transition, and the ceramic sample of x = 0. 3 exhibites a typical relaxor ferroelectric behavior. In the range of temperature from 193 to 323 K, the dielectric tunabilities of all the samples can reach above 10% and is a little stronger in ferroelectric state than that of paraelectric state. The experimental results is explained with the points of ferroelectric domains and Nano-micro-polarity. The tunabilities and the figure of merit measured at 300 K under the biasing field of E=1. 5 kV/mm for x=0.25 are 49.5% and 49.11.