A low-firing Ca<sub>5</sub>Ni<sub>4</sub>(VO<sub>4</sub>)<sub>6</sub> ceramic with tunable microwave dielectric properties and chemical compatibility with Ag

Journal article (2016)

Authors

D. Wang Guilin University of Technology
Huaicheng Xiang Guilin University of Technology
Y. Tang Guilin University of Technology
Liang Fang Guilin University of Technology
J. Khaliq Novel Aerospace Materials - Aerospace Engineering
Chunchun Li Guilin University of Technology
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
LTCC Garnet structure Microwave dielectric properties Vanadate
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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 Ca5Ni4(VO4)6 low loss microwave dielectric ceramic with A site deficient garnet structure was prepared via the conventional solid state reaction method. Ca5Ni4(VO4)6 sintered at 980°C for 4h to a relative density of 96.2% exhibits favorable microwave dielectric properties such as a permittivity of 10.9, a Q×f value of 96,500GHz, and a τ f value of -63.6ppm/°C. Its large negative τ f could be compensated by forming a solid solution with LiCa2Mg2V3O12, that led to improved properties with a near-zero τ f =-3.7ppm/°C, ε r =10.2, Q×f=59,300GHz for 0.8Ca5Ni4(VO4)6-0.2LiCa2Mg2V3O12 after sintering at 955°C for 4h. Further on, 0.8Ca5Ni4(VO4)6-0.2LiCa2Mg2V3O12 proved to be chemically compatible with Ag electrodes, so it might be a possible candidate for LTCC applications.