Paper Title:

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

Periodical Key Engineering Materials (Volumes 280 - 283)
Main Theme High-Performance Ceramics III
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 Ying Chun Zhang et al., 2007, Key Engineering Materials, 280-283, 19
Online since February, 2007
Authors Ying Chun Zhang, Zhen Xing Yue, Jin Wang, Zhi Lun Gui, Long Tu Li
Keywords Crystal Structure, Dielectric Property, ZnNb2(1-x)TixO(6-3x)
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Abstract

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.