Evolution of dielectric properties in BaZrxTi1-xO3 ceramics: Effect of polar nano-regions
Evolution of dielectric properties in BaZrxTi1-xO3 ceramics: Effect of polar nano-regions
复制标题
BaZrxTi1-xO3 陶瓷介电性能的演变：极性纳米区域的影响
DOI：
10.1016/j.actamat.2013.04.017
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发表时间：
2013-07-01
期刊：
影响因子：
9.4
通讯作者：
Zhang, Feng
中科院分区：
文献类型：
--
作者：
Xu, Qing;Zhan, Di;Zhang, Feng
采用柠檬酸盐法制备了BaZrxTi 1-xO 3（x = 0.2，0.25，0.3）陶瓷。研究了陶瓷的铁电相变行为和偏置电场诱导的介电非线性。随着锆含量的增加，陶瓷的相变行为从扩散相变转变为类弛豫相变。以不同的方式施加偏置电场导致对介电非线性的不同影响，这取决于陶瓷的锆含量。这些介电现象与嵌入陶瓷中的极性纳米区域（PNR）的极化响应有关，这些区域在室温下宏观上处于顺电态。通过将偏置电场下的介电常数拟合到多极化机理模型，确定了PNR的特征参数。结果表明，随着锆含量的增加，PNR的尺寸减小。的相变行为和介电非线性与锆含量的演变解释有关的PNR的尺寸变化。(C)2013 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
BaZrxTi1-xO3 (x = 0.2, 0.25, 0.3) ceramics were prepared by a citrate method. The ferroelectric phase transition behavior and bias electric-field-induced dielectric nonlinearity of the ceramics were investigated. With increasing zirconium content, the phase transition behavior of the ceramics changed from a diffusion phase transition to relaxor-like behavior. Applying bias electric field in diverse manners led to differing effects on the dielectric nonlinearity, depending on the zirconium content of the ceramics. These dielectric phenomena were related to the polarization response of polar nano-regions (PNRs) embedded in the ceramics, which are macroscopically in the paraelectric state at room temperature. The characteristic parameters of PNRs were determined by fitting the dielectric constants under bias electric field to a multipolarization mechanism model. It was found that the size of PNRs was decreased with increasing zirconium content. The evolution of the phase transition behavior and dielectric nonlinearity with zirconium content was interpreted in relation to the size change of PNRs. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.