Low temperature sintering and microwave dielectric properties of Li2ZnSiO4 ceramics with ZB glass

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Abstract

The influence of zinc borate (ZB) glass on densification, phase composition, microstructure and microwave dielectric properties of Li2ZnSiO4 ceramics has been investigated by using X-ray diffraction, scanning electron microscopy and Advantest network analyzer. Undoped Li2ZnSiO4 ceramics exhibited good microwave dielectric properties of ε r  = 5.8, Q × f = 14,700 GHz and τ f  = −96.6 ppm/°C. When ZB glass was added, the sintering temperature of Li2ZnSiO4 ceramics was effectively reduced to 950 °C. Addition of 25.wt% ZB glass to Li2ZnSiO4 ceramics sintered at 950 °C showed excellent dielectric properties of ε r  = 5.5, Q × f = 10,800 GHz (f = 6.8 GHz) and τ f  = −47.2 ppm/°C. Moreover, the material was compatible with Ag electrodes, making it a very promising candidate material for LTCC applications.