Abstract
A Li2ZnGe3O8 ceramic was investigated as a promising microwave dielectric material for low-temperature co-fired ceramics applications. Li2ZnGe3O8 ceramic was prepared via the conventional solid-state method. X-ray diffraction data shows that Li2ZnGe3O8 ceramic crystallized into a cubic spinel structure with a space group of P4132. Dense ceramic with a relative densities of 96.3% were obtained when sintered at 945°C for 4h and exhibited the optimum microwave properties with a relative permittivity (εr) of 10.3, a quality factor (Q×f) of 47,400GHz (at 13.3GHz), and a temperature coefficient of resonance frequency (τf) of −63.9ppm/°C. The large negative τf of Li2ZnGe3O8 ceramic could be compensated by rutile TiO2, and 0.9Li2ZnGe3O8–0.1TiO20·1TiO2 ceramic sintered at 950°C for 4h exhibited improved microwave dielectric properties with a near-zero τf of −1.6ppm/°C along with εr of 11.3 and a Q×f of 35,800GHz (11.6GHz). Moreover, Li2ZnGe3O8 was found to be chemically compatible with silver electrode when sintered at 945°C.
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