摘要
该文研究了显微结构对BaTiO3陶瓷电热特性与击穿电场的影响。采用固相反应法制备BaTiO3粉体,经干压结合冷等静压工艺成型后,在不同温度下烧结成陶瓷样品。随烧结温度提高,陶瓷晶粒长大、结构更致密,由此导致极化强度与电热效应绝热变温明显提高,但击穿电场下降。等静压工艺可进一步提升瓷体致密度并促进晶粒长大,使电热效应提升。
The relationship of microstructure with electrocaloric effect and breakdown field of BaTiO3 ferroelectric ceramics was investigated in this paper.The powders were prepared by solid-state reaction method.The samples were molded by dry press and isostatic press technology,and sintered at different temperatures.With the rise of sintering temperature,the grains grew larger and the microstructure turned denser.As a result,the polarization and electrocaloric temperature change increased notably,while the breakdown field dropped.With isostatic press processing,the samples had stronger electrocaloric effect due to higher density and large grain size.
出处
《压电与声光》
CSCD
北大核心
2011年第6期972-975,共4页
Piezoelectrics & Acoustooptics
基金
国家自然基金面上资助项目(50702005)
教育部博士点基金资助项目(20070008027)
中央高校基本科研业务费专项资金资助项目
关键词
铁电微制冷器
钛酸钡
电热效应
击穿电场
显微结构
ferroelectric micro-refrigerator
barium titanate
electrocaloric effect
breakdown electric field
microstructure
