直接测量 Ba(ZrTi)O 陶瓷中的大电卡效应。

Direct Measurement of Large Electrocaloric Effect in Ba(ZrTi)O Ceramics.

机构信息

Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices, Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology , Guangzhou 510006, China.

出版信息

ACS Appl Mater Interfaces. 2018 Feb 7;10(5):4801-4807. doi: 10.1021/acsami.7b15933. Epub 2018 Jan 23.

DOI:10.1021/acsami.7b15933

PMID:29327581

Abstract

Barium zirconate titanate (BZT) (Ba(ZrTi)O) ceramics with Zr contents of x = 5, 10, 15, 20, 25, and 30 mol % were prepared using a solid-state reaction approach. The microstructures, morphologies, and electric properties were characterized using X-ray diffraction, scanning electron microscopy, and impedance analysis methods, respectively. The dielectric analyses indicate that the BZT bulk ceramics show characteristics of phase transition from a normal ferroelectric to a relaxor ferroelectric with the increasing Zr ionic content. The electrocaloric effect adiabatic temperature change decreases with the increasing Zr content. The highest adiabatic temperature change obtained is 2.4 K for BZT ceramics with a 5 mol % of Zr ionic content.

摘要

钛酸锆酸钡（BZT）（Ba(ZrTi)O）陶瓷，其中 Zr 的含量分别为 x = 5、10、15、20、25 和 30 摩尔%，采用固态反应法制备。使用 X 射线衍射、扫描电子显微镜和阻抗分析方法分别对微结构、形貌和电性能进行了表征。介电分析表明，BZT 块状陶瓷表现出从正常铁电体到弛豫铁电体的相变特征，随着 Zr 离子含量的增加。电卡效应绝热温度变化随着 Zr 含量的增加而降低。在 Zr 离子含量为 5 摩尔%的 BZT 陶瓷中获得的最高绝热温度变化为 2.4 K。