Enhanced electrocaloric effect in lead-free NBT-based ceramics

被引：95
|
作者：
Cao, W. P. [1 ]
Li, W. L. [1 ,2 ]
Xu, D. [1 ]
Hou, Y. F. [1 ]
Wang, W. [1 ]
Fei, W. D. [1 ,3 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Sci & Technol Precis Heat Proc Met, Harbin 150001, Peoples R China
[3] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2014年 / 40卷 / 07期
关键词：
Ferroelectric properties; NBT-based ceramics; Sol-Gel flame synthetic; Electrocaloric effect; THIN-FILM;
D O I：
10.1016/j.ceramint.2014.01.149
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：
Improvement of the electrocaloric (EC) effect was investigated in the lead-free (Na,Bi)TiO3 (NBT)-based ferroelectric ceramics fabricated by a Sol Gel flame synthetic approach. It is found that the NBT-based samples with the compositions located at the morphotropic phase boundary exhibit superior EC entropy change (Delta S) and temperature change (Delta T). The highest AS of 2.20 J kg(-1) K-1, AT of 1.50 K and the EC coefficient (Delta T/Delta E) of 0.030 K cm kV(-1) are obtained in the 0.94NBT-0.06BaTiO(3) ceramic. The Delta T/Delta E value of the 0.94NBT-0.06BaTiO3 ceramic is significantly higher than that of lead-free ferroelectric materials reported so far and is comparable to the values of the lead-containing materials. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：9273 / 9278
页数：6
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