文摘
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 945xA0;°C for 4xA0;h and exhibited the optimum microwave properties with a relative permittivity (εr) of 10.3, a quality factor (QxA0;×xA0;f) of 47,400xA0;GHz (at 13.3xA0;GHz), and a temperature coefficient of resonance frequency (τf) of −63.9xA0;ppm/°C. The large negative τf of Li2ZnGe3O8 ceramic could be compensated by rutile TiO2, and 0.9Li2ZnGe3O8–0.1TiO20·1TiO2 ceramic sintered at 950xA0;°C for 4xA0;h exhibited improved microwave dielectric properties with a near-zero τf of −1.6xA0;ppm/°C along with εr of 11.3 and a QxA0;×xA0;f of 35,800xA0;GHz (11.6xA0;GHz). Moreover, Li2ZnGe3O8 was found to be chemically compatible with silver electrode when sintered at 945xA0;°C.