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Influence of Modified Solid-State Reaction Method on Sintering and Dielectric Properties of (Na_0.5Bi_0.5)WO₄ Ceramic

Xiaofeng Yuan, Xiaofeng Yuan, Yixuan Wei, Hongliang Liu, Yumeng Zhang, Wenxia Li, Aobo Fan

Journal of Ceramic Science and Technology, Vol. 16, No. 1 (2025), pp. 21-28

DOI: 10.4416/JCST2024-00012

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Abstract

In this work, (Na0.5Bi0.5)WO4 ceramic was prepared with the modified solid-state reaction method. The ceramic samples were calcined at 550 °C and then sintered at 680 °C for 4 h. After the ceramic samples had been thermally etched, their dense microstructure and straight grain boundary were observed by means of scanning electron microscopy, and a relative density of 95.1 % determined. The dielectric property of the (Na0.5Bi0.5)WO4 ceramic in this work was measured with a Q × f value of 28 000 GHz, a relative permittivity of 27.5 and a temperature coefficient of - 15 ppm/K. Compared with the measured result for the (Na0.5Bi0.5)WO4 ceramic prepared with the traditional solid-state reaction method, the sintering temperature dropped from 720 °C to 680 °C and the Q × f value increased by 57 % from 17 500 GHz to 28 000 GHz. Ethanol and isostatic pressing technology can replace the polyvinyl ethanol and traditional press effectively and the modified solid-state reaction method is an excellent way to improve the sintering and dielectric properties of ceramic material.

Keywords

LTCC, modified solid-state reaction method, microwave dielectric ceramic

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