Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics
Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics
复制标题
DOI：
10.1063/1.4950790
复制
发表时间：
2016-06-01
期刊：
影响因子：
6.1
通讯作者：
Alford, Neil McN.
中科院分区：
文献类型：
--
作者：
Le Goupil, Florian;Alford, Neil McN.
用直接测量的方法研究了(1-x)(Na0.5Bi0.5)TiO3-xKNbO(3)的两种组份(x=0.06和0.07)在准同型相界附近的电热效应。对于NBT-6KN，T-max=1.5K是在摄氏125度、70千伏/厘米下测量的，而对于NBT-7KN，T-max=0.8 K是在摄氏75度、55千伏/厘米时测量的。结果表明，介电常数中的“肩峰”TS标志着在高外加电场下的ECE峰的上限。这些结果表明，对于给定的成分，可以快速确定具有较高Ec的温度范围，这将显著加快ECEs冷却材料的选择过程。(C)2016年作者(S)。除另有说明外，所有文章内容均受知识共享署名(CC BY)许可。
The electrocaloric effect (ECE) of two compositions (x = 0.06 and 0.07) of (1-x)(Na0.5Bi0.5)TiO3-xKNbO(3) in the vicinity of the morphotropic phase boundary is studied by direct measurements. Delta T-max = 1.5 K is measured at 125 degrees C under 70 kV/cm for NBT-6KN while Delta T-max = 0.8 K is measured at 75 degrees C under 55 kV/cm for NBT-7KN. We show that the "shoulder," TS, in the dielectric permittivity, marks the upper limit of the ECE peak under high applied electric fields. These results imply that the range of temperature with high ECE can be quickly identified for a given composition, which will significantly speed up the process of materials selection for ECE cooling. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license.