Dielectric properties of the "twinned" 8H-hexagonal perovskite Ba8Nb4Ti3O24

被引：26
作者：
Rawal, R
Feteira, A
Flores, AA
Hyatt, NC
West, AR
Sinclair, DC [1 ]
Sarma, K
Alford, NM
机构：
[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England
[2] S Bank Univ, London SE1 0AA, England
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2006年 / 89卷 / 01期
关键词：
D O I：
10.1111/j.1551-2916.2005.00665.x
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：
The dielectric properties of dense ceramics of the "twinned" 8H-hexagonal perovskite Ba8Nb4Ti3O24 are reported. Single-phase powders were obtained from the mixed-oxide route at 1325 degrees C and ceramics (> 92% of the theoretical X-ray density) by sintering in air or flowing 02 at 1400 degrees-1450 degrees C. The ceramics are dc insulators with a band gap > 3.4 eV that resonate at microwave frequencies with relative permittivity, epsilon(r) similar to 44-48, quality factor, Q x f(r) similar to 21000-23500 GHz (at f(r) similar to 5.5 GHz) and temperature coefficient of resonant frequency, TCf similar to + 115 ppm/K.
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页码：336 / 339
页数：4
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