Flexoelectric polarization of barium strontium titanate in the paraelectric state
Flexoelectric polarization of barium strontium titanate in the paraelectric state
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DOI：
10.1063/1.1518559
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发表时间：
2002-10-28
影响因子：
4
通讯作者：
Cross, LE
中科院分区：
文献类型：
--
作者：
Ma, WH;Cross, LE
研究了Ba0.67Sr0.33TiO3（BST）陶瓷在21 ℃居里点以上温度下的应变梯度诱导极化（弯电效应）。在23摄氏度的挠曲电系数μ（12）是一个以上的数量级大于在铅镁陶瓷中测得的最高值。在线性居里-外斯行为的温度范围内，系数μ（12）大致与介电常数成比例;然而，比例常数高于简单离子固体的预测。BST陶瓷中的意外行为表明需要更广泛的挠曲电系数数据库。(C)2002年美国物理学会。
The strain-gradient-induced polarization (flexoelectric effect) was investigated in Ba0.67Sr0.33TiO3 (BST) ceramic at temperatures above the 21degreesC Curie point. At 23degreesC the flexoelectric coefficient mu(12) was more than one order of magnitude greater than the highest value measured in lead magnesium niobate ceramic. Over the temperature range of linear Curie-Weiss behavior, the coefficient mu(12) was roughly proportional to the dielectric permittivity; however, the constant of proportionality was higher than predicted for simple ionic solids. The unexpected behavior in the BST ceramic suggests the need for a broader database of flexoelectric coefficients. (C) 2002 American Institute of Physics.