Abstract
Low-firing (Zn0.9Mg0.1)1−xCoxTiO3 (x = 0.02–0.10) (ZMCxT) microwave dielectric ceramics with high temperature stability were synthesized via conventional solid-state reaction. The influences of Co2O3 substitution on the phase composition, microstructure and microwave dielectric properties of ZMCxT ceramics were discussed. Rietveld refinement results show the coexistence of ZnTiO3 and ZnB2O4 phases at x = 0.02–0.10. (Zn0.9Mg0.1)1−xCoxTiO3 ceramic with x = 0.06 (ZMC0.06T) obtains the best combination microwave dielectric properties of: εr = 21.58, Q × f = 53,948GHz, τf = − 54.38ppm/°C. For expanding its application in LTCC field, 3wt% ZnO-B2O3-SiO2 (ZBS) and 9wt% TiO2 was added into ZMC0.06T ceramic, great microwave dielectric properties were achieved at 900°C for 4h: εr = 26.03, Q × f = 34,830GHz, τf = − 4ppm/°C, making the composite ceramic a promising candidate for LTCC industry.
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