Microstructure and Microwave Dielectric Properties of Ba5(Nb1-xTax)4O15 (x = 0 ~ 0.5) Ceramics |
| Journal |
Key Engineering Materials (Volumes 280 - 283) |
| Volume |
High-Performance Ceramics III |
| Edited by |
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li |
| Pages |
9-12 |
| DOI |
10.4028/www.scientific.net/KEM.280-283.9 |
| Online since |
February, 2007 |
| Authors |
Fei Zhao,
Zhen Xing Yue,
Ying Chun Zhang,
Zhi Lun Gui,
Long Tu Li
|
| Keywords |
Dielectric Property, Hexagonal Perovskite, Microwave Ceramic |
| Abstract |
The Ba5(Nb1-xTax)4O15 (x=0~0.5) solid-solution ceramics with hexagonal perovskite structure were prepared by solid-state oxide route. The phases and structure of the sintered ceramics were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The influences of composition and sintering temperature on the bulk density, microstructure and microwave dielectric
properties were also investigated. As the value of x increased from 0 to 0.5, the Q×f value increases from 36,049 to 49,493 GHz (at ~9GHz), whereas the dielectric constant (εr) decreases from 39.21 to 33.03 and the temperature coefficient of resonant frequency (τf ) decreases from 78.6 to 19.4 ppm/oC. The results
indicate that the microwave dielectric properties of Ba5(Nb1-xTax)4O15 ceramics can be easily modified in a large range by changing the relative content of Ta to Nb. |
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