A novel low-firing microwave dielectric ceramic Li2ZnGe3O8 with cubic spinel structure
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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 945 °C for 4 h and exhibited the optimum microwave properties with a relative permittivity (εr) of 10.3, a quality factor (Q × f) of 47,400 GHz (at 13.3 GHz), and a temperature coefficient of resonance frequency (τf) of −63.9 ppm/°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 4 h exhibited improved microwave dielectric properties with a near-zero τf of −1.6 ppm/°C along with εr of 11.3 and a Q × f of 35,800 GHz (11.6 GHz). Moreover, Li2ZnGe3O8 was found to be chemically compatible with silver electrode when sintered at 945 °C.
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