A low-firing Ca5Ni4(VO4)6 ceramic with tunable microwave dielectric properties and chemical compatibility with Ag

Wang, Dan, Xiang, Huaicheng, Tang, Ying, Fang, Liang, Khaliq, Jibran and Li, Chunchun (2016) A low-firing Ca5Ni4(VO4)6 ceramic with tunable microwave dielectric properties and chemical compatibility with Ag. Ceramics International, 42 (13). 15094 - 15098. ISSN 0272-8842

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

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 4 h to a relative density of 96.2% exhibits favorable microwave dielectric properties such as a permittivity of 10.9, a Q×f value of 96,500 GHz, and a τf value of −63.6 ppm/°C. Its large negative τf could be compensated by forming a solid solution with LiCa2Mg2V3O12, that led to improved properties with a near-zero τf=−3.7 ppm/°C, εr=10.2, Q×f=59,300 GHz for 0.8Ca5Ni4(VO4)6−0.2LiCa2Mg2V3O12 after sintering at 955 °C for 4 h. 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.

Item Type: Article
Uncontrolled Keywords: Microwave dielectric properties, Garnet structure, LTCC, Vanadate
Subjects: F100 Chemistry
F200 Materials Science
F300 Physics
J300 Ceramics and Glasses
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Jibran Khaliq
Date Deposited: 02 Oct 2017 10:40
Last Modified: 22 Dec 2017 11:00
URI: http://nrl.northumbria.ac.uk/id/eprint/32139

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