| 摘要: |
| 利用铁电材料的电卡效应实现致冷成为当前国内外的研究热点之一.基于Maxwell 关系,围绕着准同型相界组分的Bi0.5Na0.5TiO3基无铅铁电固溶体,研究了其电卡效应,结果表明:该体系在5 kV/mm的外电场下,显示出优异的致冷特性,温度的变化量可达到1.15 K,相应的致冷强度可达0.23 K·mm/kV,在全新的固态致冷器件中显示出应用前景. |
| 关键词: 电卡 无铅 铁电致冷 准同型相界 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金(11204179,61376010);上海市教委“晨光计划”(11CG49) |
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| The electrocaloric effect of Bi0.5Na0.5TiO3-based solid solution with the composition around the morphotropic phase boundary |
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TANG Jin, WANG Feifei, LI Yan, TIAN Chengyue, WANG Qing, SHI Wangzhou
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College of Mathematics and Sciences,Shanghai Normal University
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| Abstract: |
| Recently,the electrocaloric effect of ferroelectric materials has attracted much attention at home and abroad due to its potential applications in solid-state refrigeration.In this paper,based on Maxwell relations,we study the electrocaloric effect of Bi0.5Na0.5TiO3-based lead-free ferroelectric quasi-solid solution with the composition focusing around the morphotropic phase boundary.The results show that the system has excellent refrigeration characteristics under external electric field of 5 kV/mm and the amount of change in temperature reaches 1.15 K.The corresponding refrigeration strength reaches 0.23 K·mm/kV,showing the prospect of applications in new environmental-friendly solid-state cooling devices. |
| Key words: electrocaloric effect lead-free ferroelectric refrigeration morphotropic phase boundary |
