Abstract
The phases, microstructures and microwave dielectric properties of (1 − x)Li2ZnSiO4–xCaTiO3 composite ceramics with zinc borate (ZB) glass prepared by solid-state reaction method have been investigated by using XRD, SEM and Agilent network analyzer. Compared with the pure Li2ZnSiO4 ceramics, the CaTiO3-doped Li2ZnSiO4 ceramics exhibited better microwave dielectric properties. The τf of (1 − x)Li2ZnSiO4–xCaTiO3 was found to be dependent on phase constitutions, which was related to the amount of CaTiO3. When x = 0.17, the τf of (1 − x)Li2ZnSiO4–xCaTiO3 was near 0 ppm/°C. When 25.0 wt% ZB glass was added, the sintering temperature of 0.75Li2ZnSiO4–0.25CaTiO3 ceramics was effectively reduced to 950 °C from about 1150 °C, and the ceramics showed excellent dielectric properties of er = 9.5, Q × f = 11,800 GHz (f = 7.8 GHz) and τf = −5.2 ppm/°C, making it a very promising candidate material for LTCC applications.
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