The Electrocaloric Effect in Lead-Free K0.5Na0.5NbO3-SrTiO3 Ceramics

被引：22
|
作者：
Rozic, B. [1 ,2 ]
Koruza, J. [1 ,2 ,3 ]
Kutnjak, Z. [1 ,2 ,3 ]
Cordoyiannis, G. [1 ,2 ,4 ]
Malic, B. [1 ,3 ]
Kosec, M. [1 ,2 ,3 ]
机构：
[1] Jozef Stefan Inst, Ljubljana 1001, Slovenia
[2] Ctr Excellence Namaste, Ljubljana 1001, Slovenia
[3] Jozef Stefan Int Postgrad Sch, Ljubljana 1001, Slovenia
[4] Univ Athens, Dept Phys, Athens 15784, Greece
来源：
FERROELECTRICS | 2013年 / 446卷 / 01期
关键词：
Electrocaloric effect; relaxor ferroelectric; lead-free ceramics; REFRIGERATION; RELAXORS;
D O I：
10.1080/00150193.2013.820996
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Direct measurements of the electrocaloric effect (ECE) in bulk lead-free relaxor K0.5Na0.5NbO3-SrTiO3 (KNN-STO) ceramics sintered in air have been performed by using electrocaloric thermometry, i.e., a high-resolution calorimetry with a small modification to the experimental setup and software. The obtained results confirm the existence of a large ECE in this material in the vicinity of the ferroelectric phase transition, where the electrocaloric temperature change T-EC around 0.5K was achieved under a field of 80kV/cm. At room temperature T-EC is comparable with that observed in lead-based ceramic materials, so far the most studied electrocaloric materials, which, however, are less environmentally friendly due to the toxicity of lead.
引用
收藏
页码：39 / 45
页数：7
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