Enhancement of the electrocaloric effect over a wide temperature range in PLZT ceramics by doping with Gd3+ and Sn4+ ions

被引：43

作者：

Lu, Biao ^{[1
,2
,3
]}

Yao, Yingbang ^{[1
]}

Jian, Xiaodong ^{[1
]}

Tao, Tao ^{[1
]}

Liang, Bo ^{[1
]}

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

Lu, Sheng-Guo ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Mat & Energy, Guangdong Prov Key Lab Funct Soft Condensed Matte, Guangdong Prov Res Ctr Smart Mat & Energy Convers, Guangzhou 510006, Guangdong, Peoples R China

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

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

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2019年 / 39卷 / 04期

关键词：

Ferroelectric; PLZT; Doping; Phase transition; Electrocaloric effect; MODIFIED LEAD-ZIRCONATE; DIELECTRIC-PROPERTIES; GRAIN-SIZE; FERROELECTRIC CERAMICS; THIN-FILM; DEPENDENCE; BEHAVIOR; PHASES;

D O I：

10.1016/j.jeurceramsoc.2018.11.042

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：

The electrocaloric effect (ECE) in gadolinium and tin ions doped lead lanthanum zirconate titanate ceramics was investigated. Five samples with different compositions and hence different relaxor behaviors and polarization properties were prepared via a conventional solid-state reaction process. The ECE was measured directly by a high resolution thermometer from 293 K to 423 K. The results show that the ECE is mainly determined by the number of polarization states and polar-correlation strength. Furthermore, the results reveal that the temperature variation of ECE around Curie temperature is associated with the generation rate, activation energy, size and freezing temperature of polar nanoregions. As a result, Sn doped PLZT composition exhibits the best ECE, Le., a peak Delta T > 2 K obtained at 5 MV/m, and Delta T > 1.78 K achieved in the whole temperature range measured at the same field, which are very attractive for high performance ECE devices.

引用

页码：1093 / 1102

页数：10

共 70 条

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[Anonymous], 1960, Sov Phys Solid State

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