Mg-substituted ZnNb2O6-TiO2 composite ceramics for RF/microwaves ceramic capacitors |
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Authors: | Wu Sp Luo Jh |
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Affiliation: | School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China |
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Abstract: | Microstructure and microwave dielectric properties of Mg-substituted ZnNb2O6-TiO2 microwave ceramics were investigated. Mg acted as a grain refining reagent and columbite phase stabilization reagent. With an increasing Mg content, the amount of ixiolite (Zn, Mg) TiNb2O8 decreased, and the amount of (Zn0.9Mg0.1)0.17Nb0.33Ti0.5O2 and columbite increased. ZnO-Nb2O5-1.75TiO2-5 mol.%MgO exhibited excellent dielectric properties (at 950 °C): ?r = 35.6, Q × f = 16,000 GHz (at 5.6 GHz) and τf = −10 ppm/°C. The material was applied successfully to make RF/microwaves ceramic capacitor, whose self-resonance frequency was 19 GHz at low capacitance of 0.13 pF. |
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Keywords: | Dielectric properties Microstructure Grain boundaries Capacitors ZnNb2O6-TiO2 |
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