Microwave dielectric properties of BaO-2(1 − x)ZnO-xNd2O3-4TiO2 (x = 0-1.0) ceramics |
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Authors: | Shengquan Yu Shuren ZhangBin Tang Xiaohua ZhouYouwei Fang |
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Affiliation: | State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract: | Microwave dielectric properties of (1 − x)BaZn2Ti4O11-xBaNd2Ti4O12 (x = 0-1.0) ceramics were investigated by the solid-state reaction with the purpose of finding a microwave ceramics with high dielectric constant (?r), high quality factor (Q × f) and low temperature coefficient of resonant frequency (τf). A two phase system BaZn2Ti4O11-BaNd2Ti4O12 was formed and SEM photographs show equiaxed BaZn2Ti4O11 grains and columnar BaNd2Ti4O12 grains. The microwave dielectric properties were strongly determined by the chemical composition. As increasing x from 0 to 1.0, the phase composition varied from pure BaZn2Ti4O11, to the two phase system BaZn2Ti4O11-BaNd2Ti4O12 and then to pure BaNd2Ti4O12. Therefore, the ?r raised from 29.1 to 82.0 and the Q × f values decreased from 54,630 GHz to 8110 GHz, and the τf values increased from −29 ppm/°C to 94 ppm/°C. 0.8BaZn2Ti4O11-0.2BaNd2Ti4O12 ceramics sintered at 1250 °C for 2.5 h had ?r = 39.1, Q × f = 37,850 GHz and τf = −9 ppm/ °C. |
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Keywords: | A Sintering C Dielectric properties Microwave ceramics |
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