摘要
采用类溶胶－凝胶方法制备了铁电Ｂｉ４Ｔｉ３Ｏ１２超微粉，分别用Ｘ射线衍射、透射电子显微镜、激光散射粒度仪和差热分析仪对其结构、形貌、粒度和相变特性进行了测试分析。结果表明，超微粉形成了正交晶系Ｂｉ４Ｔｉ３Ｏ１２结构，晶粒尺寸为１０～５０ｎｍ。由微粉制备了Ｂｉ４Ｔｉ３Ｏ１２陶瓷，其介电常数和损耗角正切分别为ε＝１０５．６和ｔｇδ＝０．０５２（１００Ｈｚ）及ε＝９７．２和ｔｇδ＝０．０００３６（４ＭＨｚ），铁电参数矫顽电场Ｅｃ为２．９１×１０６Ｖ／ｍ，剩余极化强度Ｐｒ为７×１０－３Ｃ／ｍ２。
Ferroelectric Bi 4Ti 3O 12 ultrafine powders were prepared by quasi Sol Gel method and characterized by X ray diffraction,transmission electron microscopy,laser scattering size analyzer and thermal analyzer.The grain size of the powders is from 10 to 50 nm. The Bi 4Ti 3O 12 ceramics were prepared from the powders and the dielectric and ferroelectric properties were characterized.The ceramic′s dielectric parameters are: ε =105.6,tg δ = 0.052 at 100 Hz and ε =97.2, tg δ = 0.000 36 at 4 MHz. The ferroelectric parameters are: E c=2.91×10 6 V/m and P r=7.0× 10 -3 C/m 2.
出处
《压电与声光》
CAS
CSCD
北大核心
1997年第6期415-419,共5页
Piezoelectrics & Acoustooptics
关键词
超微粉
陶瓷
铁电体钛酸铋
ultrafine powder,ceramic,ferroelectric,Bi 4Ti 3O 12
