D. Suvorov—contributing editor
Phase Composition and Microwave Dielectric Properties of ZnAl2O4–Co2TiO4 Low-Permittivity Ceramics with High Quality Factor
Article first published online: 3 DEC 2010
© 2010 The American Ceramic Society
Journal of the American Ceramic Society
Volume 94, Issue 1, pages 20–23, January 2011
How to Cite
Lei, W., Lu, W.-Z., Wang, X.-H., Liang, F. and Wang, J. (2011), Phase Composition and Microwave Dielectric Properties of ZnAl2O4–Co2TiO4 Low-Permittivity Ceramics with High Quality Factor. Journal of the American Ceramic Society, 94: 20–23. doi: 10.1111/j.1551-2916.2010.04247.x
This work was financially supported by the National Natural Science Foundation of China (NSFC-50902055), Program for New Century Excellent Talents in University (NCET-07-0329), and China Postdoctoral Science Foundation (CPSF-20080440925).
- Issue published online: 5 JAN 2011
- Article first published online: 3 DEC 2010
- Manuscript No. 28030. Received May 16, 2010; approved October 14, 2010.
Phase composition and microwave dielectric properties of (1−x)ZnAl2O4–xCo2TiO4 ceramics synthesized by a conventional solid-state reaction were investigated. ZnAl2O4 can form a solid solution with Co2TiO4 for x≤0.3 and x≥0.7, while subgrains with ZnAl2O4-based and Co2TiO4-based spinel phase composition appear alternately on the same large grains for 0.4≤x≤0.6. The ɛr and τf value of the (1−x)ZnAl2O4–xCo2TiO4 ceramics increase within the range of 8.3–16.9 and −71.3 to −40.8 ppm/°C with the increasing of x value, respectively. And the Q×f values with 147 600 GHz at x=0.2, 127 000 GHz at x=0.5, and 148 810 GHz at x=0.8 are all obviously higher than that of the end member ZnAl2O4 (96 800 GHz) and Co2TiO4 (98 060 GHz), which results from structural stability and lower inner stress.