Microstructures and microwave dielectric properties of MgSiO-CaSrTiO ceramics.

The microstructures and microwave dielectric properties of (1 − x)MgSiO- xCaSrTiO ( x = 0.05-0.08) composite ceramics, prepared via a conventional solid-state ceramic route, were investigated. As expected, an increase in sintering temperature effectively promoted densification and enhanced the dielectric properties of the (1 − x)MgSiO- xCaSrTiO ceramics used in this study. As the amount of CaSrTiO increased, temperature coefficient of resonant frequency ( τ) increased; with a near-zero τ obtained for samples where x = 0.06. The optimal microwave dielectric properties, a dielectric constant ( ε) of 8.01, high quality factor ( Q × f) of 58,389 GHz (at 14.6 GHz) and a τ of −3.62 ppm/°C, were obtained for 0.94MgSiO-0.06CaSrTiO sintered at 1,440 °C for 3 h. [ABSTRACT FROM AUTHOR]