Ultra‐low temperature sintering microwave dielectric ceramics based on Ag2O–MoO3 binary system

Abstract

AbstractThe Ag2Mo2O7 and Ag6Mo10O33 ceramics for ultra‐low temperature co‐fired ceramic application were prepared by the solid‐state reaction route. The optimized densification temperatures of Ag2Mo2O7 and Ag6Mo10O33 are 460°C and 500°C, respectively. The phase structures and microstructures of these ceramics were systematically studied. The Ag2Mo2O7 ceramic sintered at 460°C/4 h exhibits excellent microwave dielectric properties with εr=13.3, Q×f=25 300 GHz and τf=−142 ppm/°C at 9.25 GHz. The Ag6Mo10O33 ceramic sintered at 500°C/4 h shows the microwave dielectric properties with εr=14.0, Q×f=8500 GHz and τf=−50 ppm/°C at 9.00 GHz. Moreover, when Ag2Mo2O7 samples are sintered at ultra‐low sintering temperatures of 420°C‐490°C, the Q×f values of them are all above 20 000 GHz. Besides, the Ag2Mo2O7 ceramic does not react with silver powder or aluminum powder. The variation of relative permittivity, resonant frequency, and Q×f values as a function of operating temperature has been also studied. All the results indicate that the Ag2Mo2O7 ceramic is a good candidate for ultra‐low temperature co‐fired microwave devices.