无机材料学报 ›› 2019, Vol. 34 ›› Issue (9): 1011-1014.DOI: 10.15541/jim20180551

• 研究快报 • 上一篇    下一篇

Pb0.3CaxSr0.7-xTiO3陶瓷的室温电卡效应

韩刘洋1,2,3,郭少波1(),闫世光1,RÉMIENSDenis3,王根水1(),董显林1   

  1. 1.中国科学院 上海硅酸盐研究所,无机功能与器件重点实验室,上海200050
    2.中国科学院大学,北京100049
    3.上法兰西理工大学, 瓦朗谢纳 59313, 法国
  • 收稿日期:2018-11-20 出版日期:2019-09-20 发布日期:2019-05-29

Electrocaloric Effect in Pb0.3CaxSr0.7-xTiO3 Ceramics Near Room Temperature

HAN Liu-Yang1,2,3,GUO Shao-Bo1(),YAN Shi-Guang1,RÉMIENS Denis3,WANG Gen-Shui1(),DONG Xian-Lin1   

  1. 1.Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
    3.Université Polytechnique Hauts-de-France, Valenciennes 59313, France;
  • Received:2018-11-20 Online:2019-09-20 Published:2019-05-29
  • Supported by:
    Foundation item: National Natural Science Foundation of China(11604354, 11774366);Chinese Academy of Sciences President’s International Fellowship initiative(2017VEA0002);Research Equipment Program of Chinese Academy of Sciences(YJKYYQ20170018)

摘要:

电卡效应是极性材料中极化强度和温度的相互作用, 具有电卡效应的铁电陶瓷材料在高效固态制冷领域有很好的应用前景。本研究以Pb0.3CaxSr0.7-xTiO3 [PCST(x), x = 0.00, 0.05, 0.10, 0.15]陶瓷为对象, 系统研究了在电场作用下Ca含量对材料介电性能和铁电性能的影响, 并通过间接法计算了不同温度下材料的电卡温变。研究结果显示: Ca含量可显著调控PCST陶瓷的弥散相变特性, PCST(0.05)的相变弥散因子随外加电场的增大而增大, 可利用弥散相变在较宽温度区间内获得较大的电卡效应。经计算可得: PCST(0.05)在室温下可产生1.71 K的温变。当电场为8 kV/mm时, PCST(0.05)陶瓷在5~70 ℃的温度范围内, 绝热温变均大于1 K, 表现出优异的电卡效应。

关键词: 电卡效应, 铁电陶瓷, 弥散相变

Abstract:

The electrocaloric (EC) effect is strongly related to interaction of polarization and temperature changes, showing great potential in high-efficient solid state refrigeration. This work focuses on the Pb0.3CaxSr0.7-xTiO3 (PCST(x), x = 0.00, 0.05, 0.10, 0.15) ceramics in which the influence of Ca content on dielectric and ferroelectric property under electric field was studied, and the EC temperature change was calculated through indirect method. Substitution of Ca largely modifies the diffused phase transition behaviors of PCST ceramics, which the diffusion exponent of PCST(0.05) increases with electric field up, indicating a promising wide temperature range of large electrocaloric effect. Thus, the largest adiabatic temperature change (1.71 K) is obtained near the room temperature in PCST(0.05) by indirect method. With an electric field of 8 kV/mm, PCST(0.05) ceramic shows good EC effect in a wide temperature range that the adiabatic temperature change is larger than 1 K from 5 ℃ to 70 ℃.

Key words: electrocaloric effect, ferroelectrics ceramics, diffused phase transition

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