Lead-free Ba0.8Ca0.2(ZrxTi1-x)O3 ceramics with large electrocaloric effect

被引：135
作者：
Asbani, B. [1 ,2 ]
Dellis, J. -L. [1 ]
Lahmar, A. [1 ]
Courty, M. [3 ]
Amjoud, M. [2 ]
Gagou, Y. [1 ]
Djellab, K. [3 ]
Mezzane, D. [2 ]
Kutnjak, Z. [4 ]
El Marssi, M. [1 ]
机构：
[1] Univ Picardie Jules Verne, LPMC, F-80039 Amiens, France
[2] FSTG Univ Cadi Ayyad, LMCN, Marrakech, Morocco
[3] Univ Picardie Jules Verne, UMR7314, LRCS, F-80039 Amiens, France
[4] Jozef Stefan Inst, Ljubljana 1000, Slovenia
来源：
APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 04期
关键词：
ROOM-TEMPERATURE; BARIUM-TITANATE; DIELECTRIC-PROPERTIES; CALORIC PROPERTIES; HEAT; REFRIGERATION;
D O I：
10.1063/1.4906864
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The electrocaloric effect was investigated in lead-free Zr doped Ba0.8Ca0.2(ZrxTi1-x)O-3 (BCTZ) ceramics synthesized by a conventional sintering process. Room-temperature x-ray diffraction analysis showed that the tetragonal structure is obtained in BCTZ for x <= 0.08 and a pseudo cubic phase for x > 0.08. The dielectric spectroscopy and calorimetry revealed that the Curie temperature decreases as a consequence of Zr doping and that the BCTZ exhibits a first order ferroelectric phase transition. The electrocaloric effect was determined by the calculation of the electrocaloric change of temperature (Delta T) using the Maxwell relation based on the P-E hysteresis loops measured at different temperatures. A large electrocaloric responsivity Delta T/Delta E = 0.34 x 10(-6) Km/V was found for x = 0.04, which significantly exceeds of values found so far in other lead-free electrocaloric materials. (C) 2015 AIP Publishing LLC.
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页数：4
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