Abstract
Abstract Ceramics in the system MgO–SiO 2 –TiO 2 were prepared by standard mixed oxide route. By adding ZnO–B 2 O 3 to the starting mixtures, the firing temperature of the ceramics could be reduced to 1160 °C. Small additions of MnCO 3 and CaTiO 3 improve microwave dielectric properties leading to an increase in insulation resistance and a decrease in temperature coefficient of capacitance. By adding Co 2 O 3 grain growth can be inhibited and the dielectric Qf value greatly increased. The resultant ceramic material exhibited low dielectric constant and low dielectric loss: relative permittivity ( e r ): 20±2; temperature coefficient of capacitance ( τ c ): 0±30 ppm/°C; Qf : 100,000 (at 10 GHz); insulation resistance: 10 13 Ω cm:
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