Abstract
The effects of H3BO3 additive on the sintering behavior, phase composition, microstructure and microwave dielectric properties of CoZrNb2O8 ceramics were investigated based on the research of pure-phase CoZrNb2O8 (CZN) ceramics. When 2.5 wt% H3BO3 was added to CoZrNb2O8 ceramics, the sintering temperatures significantly decreased from 1250 to 1200 °C due to the formation of liquid phase. The ceramic sintered at 1200 °C for 4 h exhibited excellent microwave dielectric properties of er = 21.62, Q·f = 40,200 GHz and τf = −16.38 ppm/ °C. Compared to the results of CZN ceramics, the H3BO3 additives effectively lowered the sintering temperature of CZN ceramics due to the liquid phase effect without detrimental effect on the properties.
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