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Microstructure and Microwave Dielectric Properties of Ba5(Nb1-xTax)4O15 (x = 0 ~ 0.5) Ceramics

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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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Periodical:

Key Engineering Materials (Volumes 280-283)

Pages:

9-12

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.280-283.9

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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

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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