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

X. Yuan^1,2, H. Liu¹, Y. Wei³, Y. Wang¹, Q. Gao¹

¹ School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China
² State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
³ School of Foreign Languages, Anyang Institute of Technology, Anyang 455000, China

received May 30, 2022, received in revised form November 24, 2022, accepted November 25, 2022

Vol. 14, No. 1, Pages 11-16   DOI: 10.4416/JCST2022-00006

Abstract

Low-sintering-temperature (Na_1-xK_x)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 (Na_1-xK_x)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 (Na_0.8K_0.2)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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