Abstract
A novel low-temperature co-fired ceramic Li2SrSiO4 with low-εr and high-Q was synthesized through solid-state reaction. XRD results showed that the Li2SrSiO4 ceramic formed a single hexagonal structure with a space group of P3121. The microwave dielectric properties of Li2SrSiO4 ceramic sintered at 880 °C were εr = 7.4 ± 0.1, Q × f = 100,700 ± 2000 GHz, and τf = −85.4 ± 2.4 ppm/℃. The PVL chemical bond theory indicated that the low sintering temperature of Li2SrSiO4 ceramic might be ascribed to the weak covalency (18 %) of SiO bond. A near-zero τf (‒1.9 ± 1.8 ppm/℃) combined with εr = 8.2 ± 0.1, and Q × f = 63,200 ± 1900 GHz was obtained by adding SrTiO3 to form 0.94Li2SrSiO4 - 0.06SrTiO3 composite ceramic. Given their chemical compatibility with Ag powders, the Li2SrSiO4 ceramics can be a candidate dielectric material for LTCC applications.
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