Microstructures and Microwave Dielectric Properties of (Ba,Sr)(Ga1/2Ta1/2)O3.
- 1 January 1991
- journal article
- Published by Japan Society of Powder and Powder Metallurgy in Journal of the Japan Society of Powder and Powder Metallurgy
- Vol. 38 (6) , 745-748
- https://doi.org/10.2497/jjspm.38.745
Abstract
The effects of the replacement of Sr by Ba for Sr(Ga1/2Ta1/2)O2 ceramics (SGT) on microwave dielectric properties and microstructures were investigated. With the increase of the replacement of Sr to Ba, a single perovskite phase changed to mixed crystalline phases, which were composed of (Ba, Sr)5Ta4O15 or unknown phases in addition to a perovskite phase. Microwave Q and temperature coefficients of resonant frequencies (τf) were improved with the replacement of Sr by Ba. (Ba0.6, Sr0.4)(Ga1/2Ta1/2)O3 ceramics showed a dielectric constant of 27.7, Q value of 10000 at 9GHz and τf=-4ppm/°C. The relationship between microwave Q and microstructures is discussed.Keywords
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