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Title of Journal: J Mater Sci Mater Electron

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Abbravation: Journal of Materials Science: Materials in Electronics

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Springer US

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1573-482X

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Microwave dielectric properties of lowfired CoNb

Authors: Yun Zhang Shuya Liu Yingchun Zhang Maoqiao Xiang
Publish Date: 2016/06/29
Volume: 27, Issue: 11, Pages: 11293-11298
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Abstract

Lowfired B2O3doped CoNb2O6 microwave dielectric ceramics were synthesized via conventional solidstate method The effects of B2O3 additives on their sintering behavior phase composition and microwave dielectric properties were investigated systematically The addition of B2O3 as liquid phase successfully lowered the sintering temperature of CoNb2O6 ceramics from 1200 to 1000 °C The system remained orthorhombic columbite phase at the level of 05–15 wt B2O3 addition However a trace amount of Co4Nb2O9 second phase with major CoNb2O6 phase was observed for the 2 wt B2O3added sample The microwave dielectric properties were found to strongly correlate with the sintering temperature as well as the amount of B2O3 addition With 15 wt B2O3 CoNb2O6 ceramics sintered at 1000 °C possessed optimum microwave dielectric properties with an ε r of 224 a high Q × f of 43979 GHz and a τ f of −462 ppm/°C

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