Li4WO5
A temperature stable low-firing microwave dielectric ceramic with rock salt structure
Jie Li (Safety and Security Science, Guilin University of Technology)
Liang Fang (Guilin University of Technology)
Hao Luo (Guilin University of Technology)
Jibran Khaliq (TU Delft - Novel Aerospace Materials)
Ying Tang (Guilin University of Technology)
Chunchun Li (Guilin University of Technology)
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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.