Effect of BaWO4 on the Microwave Dielectric Properties of Ba(Mg1/3Ta2/3)O3 Ceramics |
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Authors: | Ki Hyun Yoon Dong Pil Kim Eung Soo Kim |
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Affiliation: | Department of Ceramic Engineering, Yonsei University, Seoul 120749, Korea |
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Abstract: | Physical and microwave dielectric properties of complex perovskite Ba(Mg1/3Ta2/3)O3 ceramics have been investigated as a function of the amount of BaWO4 in the temperature range from 20° to 80°C at 10.5 GHz. Up to 0.05 mol BaWO4 addition, the lattice constant ratio ( c/a ), ordering parameter, apparent density, and unloaded Q all increase, due to the increase in the substitution of Ta5+ ions of Ba(Mg1/3Ta2/3)O3 by W6+ ions from the melted BaWO4 at above 1430°C. With further addition of BaWO4, the unloaded Q decreases, due to an increase of the BaWO4 phase. The temperature coefficient of resonant frequency (TCF) can be controlled by the volume mixture rule of Ba(Mg1/3Ta2/3)O3 and BaWO4. When 0.09 mol BaWO4 is added, TCF becomes 0 ppm/°C. |
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