Li4WO5

A temperature stable low-firing microwave dielectric ceramic with rock salt structure

Journal article (2016)

Authors

J. Li , Guilin University of Technology
Liang Fang Guilin University of Technology
Hao Luo Guilin University of Technology
J. Khaliq Novel Aerospace Materials - Aerospace Engineering
Ying Tang Guilin University of Technology
Chunchun Li Guilin University of Technology
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
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Published Date

2016

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

A Li4WO5 ceramic with rock salt structure was prepared by the solid-state reaction method and its microwave dielectric properties was demonstrated for the first time. It could be well densified at relatively low sintering temperature (~890°C). XRD and DTA analysis revealed a phase transformation from cubic to orthorhombic occured at 700°C. Excellent microwave dielectric properties with a near-zero temperature coefficient of resonant frequency ~-2.6ppm/°C, a relative permittivity ~8.6 and a quality factor ~23,100GHz (at 11.0GHz) was obtained. Li4WO5 was found to be chemically compatible with silver powders when sintered at 890°C. All the results indicate that the Li4WO5 ceramic is a promising candidate as a base material in low temperature cofired ceramic technology.