Effects of Ti4+ Substitution on Microstructure and Microwave Dielectric Properties of ZnNb2(1-x)TixO(6-3x) Ceramics

Abstract:

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The microstructure and microwave dielectric properties of dielectric ceramics comprised of ZnNb2(1-x)TixO(6-3x) (x = 0 ~ 1) were investigated systematically using X-ray powder diffraction, SEM and a network analyzer in this study. The results showed that four phases were observed in this system. The dielectric properties at microwave frequencies exhibit a significant dependence on the composition and crystal structure of the ceramics. The dielectric constant ( er) of ZnNb2(1-x)TixO(6-3x)ceramics increases with increasing Ti content and the quality factors (Q ×f) significantly decreased. However, the temperature coefficient of resonant frequency ( t f ) changes from –59.08 ppm/oC at x = 0 to + 25.1 ppm/oC at x = 1, and a zero temperature coefficient of resonant frequency ( t f ) for this ceramics system was obtained at x = 0.84.

Info:

Periodical:

Key Engineering Materials (Volumes 280-283)

Edited by:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li

Pages:

19-22

DOI:

10.4028/www.scientific.net/KEM.280-283.19

Citation:

Y. C. Zhang et al., "Effects of Ti4+ Substitution on Microstructure and Microwave Dielectric Properties of ZnNb2(1-x)TixO(6-3x) Ceramics", Key Engineering Materials, Vols. 280-283, pp. 19-22, 2005

Online since:

February 2007

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$35.00

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