Anisotropic field induced phase transitions and negative electrocaloric effect in rhombohedral Mn doped Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals

被引：8
作者：
Zhou, Yarning [1 ]
Li, Qiang [1 ]
Zhuo, Fangping [1 ]
Yan, Qingfeng [1 ]
Zhang, Yiling [2 ]
Chu, Xiangcheng [2 ]
机构：
[1] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
[2] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2018年 / 44卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Negative electrocaloric; Anisotropic; Ferroelectric; Phase transition; SOLID-STATE REFRIGERATION; ROOM-TEMPERATURE; THIN-FILMS;
D O I：
10.1016/j.ceramint.2018.02.108
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) of Mn doped Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PIN-PMN-PT:Mn) single crystals with particular emphasis on the impact of crystallographic orientations and phase transitions were investigated systematically. Orientation-dependent phase transitions have been demonstrated by the dielectric and strain behaviors. Intriguingly, the negative ECE of -0.02 degrees C and -0.002 degrees C were obtained firstly in [001]-oriented PIN-PMN-PT:Mn crystals near the rhombohedral -> tetragonal phase transformation and in [011]-oriented crystals near the rhombohedral -> orthorhombic phase transformation, respectively. However, only the positive ECE was found in [111]-oriented crystals near the tetragonal -> rhombohedral phase transition. Additionally, the maximum ECE temperature changes calculated in [001]-, [011]- and [111]-oriented crystals were 0.33 degrees C, 0.46 degrees C and 0.38 degrees C, respectively. Our results suggest that the negative ECE is attributed to electric field-induced phase transitions, whose critical field decreases with the increase of temperature. The phase transition-mediated coexistence of positive and negative effects in the relaxor-ferroelectric single crystals is beneficial to enhance the efficiency of the solid-state cooling devices.
引用
收藏
页码：9045 / 9052
页数：8
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