Giant Electrocaloric Response Over A Broad Temperature Range in Modifi ed BaTiO 3 Ceramics

被引：396

作者：

Qian, Xiao-Shi ^{[1
,2
]}

Ye, Hui-Jian ^{[2
,4
]}

Zhang, Ying-Tang ^{[2
,5
]}

Gu, Haiming ^{[1
,2
]}

Li, Xinyu ^{[1
,2
]}

Randall, C. A. ^{[2
,6
]}

Zhang, Q. M. ^{[1
,2
,3
]}

机构：

[1] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA

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

[3] Tsinghua Univ, Beijing 100084, Peoples R China

[4] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[5] Shaanxi Univ Technol, Inst Funct Mat, Sch Mat Sci & Engn, Hanzhong 723003, Peoples R China

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

来源：

ADVANCED FUNCTIONAL MATERIALS | 2014年 / 24卷 / 09期

关键词：

electrocaloric response; BZT ceramics invariant critical points; SINGLE-CRYSTAL; BEHAVIOR; STRENGTH; TITANATE;

D O I：

10.1002/adfm.201302386

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(ZrxTi1-x)O-3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(ZrxTi1-x)O-3 bulk ceramics at x approximate to 0.2 exhibit a large adiabatic temperature drop of 4.5 K, a large isothermal entropy change of 8 J kg(-1) K-1, and a large EC coefficient (|T-c/E| = 0.52 x 10(-6) KmV(-1) and S/E = 0.93 x 10(-6) J m kg(-1) K-1 V-1) over a 30 K temperature range. These properties added together indicate a general solution of the electrocaloric materials with high performance for practical cooling applications.

引用

页码：1300 / 1305

页数：6

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