Glass-ceramics of barium strontium titanate for high energy density capacitors

被引:189
|
作者
Gorzkowski, E. P. [1 ]
Pan, M.-J. [1 ]
Bender, B. [1 ]
Wu, C. C. M. [1 ]
机构
[1] USN, Res Lab, Multifunct Mat Branch, Washington, DC 20375 USA
关键词
glass-ceramic; breakdown strength; ferroelectric materials;
D O I
10.1007/s10832-007-9127-1
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Barium strontium titanate glass-ceramics were successfully produced with one major crystalline phase when Al2O3 was added to the melt. A dielectric constant of 1000 and a breakdown strength of 800 kV/cm was achieved; however the energy density was only measured to be 0.3-0.9 J/cm(3). These energy density values were lower than anticipated due to the presence of dendrites and pores in the microstructure. Using BaF2 as a refining agent improved the microstructure and doubled the energy density for BST 80/20 samples. However, no refining agent reduced the increasing amount of hysteresis that developed with increasing applied electric field. This phenomenon is believed to be due to interfacial polarization.
引用
收藏
页码:269 / 276
页数:8
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