Abstract
A low-firing microwave dielectric ceramic BaCaV2O7 with orthorhombic structure was fabricated by the conventional solid-state reaction method. The phase purity, microstructure, and microwave dielectric properties were investigated. The optimum densification temperature for the BaCaV2O7 ceramic was 830°C. It showed excellent microwave dielectric properties with a relatively low permittivity (εr~8.9), a high quality factor Qu×f value of 31,362GHz and a negative temperature coefficient of resonant frequency (τf) of −68.2ppm/°C. CaTiO3 was added into BaCaV2O7 ceramic to obtain a near zero τf. BaCaV2O7 ceramic doped with 5wt% CaTiO3 sintered at 880°C for 2h exhibited a near zero τf~−3.5ppm/°C with εr~9.6, Qu×f~26,338GHz.
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