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Influence of Modified Solid-State Reaction Method on Sintering and Dielectric Properties of (Na0.5Bi0.5)WO4 Ceramic
Xiaofeng Yuan1,2, Yixuan Wei3, Hongliang Liu1, Yumeng Zhang1, Wenxia Li1, Aobo Fan1
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 June 11, 2024, received in revised form December 24, 2024, accepted January 01, 2025
Vol. 16, No. 1, Pages 21-28 DOI: 10.4416/JCST2024-00012
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.
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Keywords
LTCC, modified solid-state reaction method, microwave dielectric ceramic
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