Direct measurement of electrocaloric effect in lead-free (Na0.5Bi0.5)TiO3-based multilayer ceramic capacitors

被引：21

作者：

Le Goupil, Florian ^{[1
]}

Baker, Amanda ^{[2
,3
]}

Tonus, Florent ^{[1
]}

Berenov, Andrey ^{[1
]}

Randall, Clive A. ^{[2
,3
]}

Alford, Neil McN ^{[1
]}

机构：

[1] Imperial Coll London, Dept Mat, London SW7 2AZ, England

[2] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

[3] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2019年 / 39卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

Lead-free ceramics; Ferroelectric relaxor; Electrocaloric materials; Multilayer ceramic; Capacitors; TEMPERATURE-RANGE; DEVICE;

D O I：

10.1016/j.jeurceramsoc.2019.04.032

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Multilayer ceramic capacitors (MLCCs) of lead-free NBT-based ceramics are produced and their electrocaloric effect (ECE) is characterised for the first time. Dense MLCCs with 97 mu m-thick active layers are successfully produced by tape casting. Dielectric permittivity measurements reveal the MLCCs to have properties similar with that reported for the corresponding bulk ceramics, including T-d similar to 50 degrees C and T-s similar to 100 degrees C. Direct ECE measurements also reveal agreement and confirm the previously reported tendency of the high-field ECE peak to shift towards T-s. The highest value of ECE, Delta T-max similar to 1.7K is measured at 90 degrees C under 90kV/cm. A low breakdown strength of 93kV/cm needs to be solved to realise stronger electric fields and achieve commercially viable ECE values.

引用

页码：3315 / 3319

页数：5

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