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Investigation into the Solid-Solution (Na_1-xK_x)₂Mo₂O₇ Ceramic and the Effect on Sintering Property

X. Yuan, X. Yuan, H. Liu, Y. Wei, Y. Wang, Q. Gao

Journal of Ceramic Science and Technology, Vol. 14, No. 1 (2023), pp. 11-16

DOI: 10.4416/JCST2022-00006

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Abstract

Low-sintering-temperature (Na1-xKx)2Mo2O7 (0.0≤x≤0.2) ceramic was fabricated with the modified solid-phase sintering method. The sintering character and microwave dielectric property of the (Na1-xKx)2Mo2O7 (0.0≤x≤0.2) ceramic were studied systematically. With the modified solid phase sintering method and ion substitution, the mass transfer efficiency of the ceramic powder was improved in the sintering procedure, which decreased the sintering temperature of the Na2Mo2O7 ceramic from 575 °C to 440 °C. Among the components, the (Na0.8K0.2)2Mo2O7 ceramic was sintered well at 440 °C with a permittivity of 10.0, a Q × f value of 48 000 GHz and a temperature coefficient of -75 ppm/K. The modified solid-phase sintering method is a potential substitution for the conventional solid-state method and the ion substitution is an effective way to further lower the sintering temperature.

Keywords

Low sintering temperature, sintering performance, dielectric ceramic

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