Microwave dielectric properties of Mg0.95Co0.05TiO3–(Ca0.8Sr0.2)0.6La0.267TiO3 ceramics synthesized by polymeric precursor method

Abstract

The composite (1 − y)Mg0.95Co0.05TiO3–y(Ca0.8Sr0.2)0.6La0.267TiO3; (1 − y)MCoT–yCSLT microwave dielectric ceramics were synthesized by a polymeric precursor method. Phase formation and particle morphology of the ceramics were investigated by TGA/DSC, XRD and FESEM. Calination of (1 − y)MCoT–yCSLT polymeric precursor at 700 °C yielded ceramic powder with nano-sized particles. Rietveld refinement of sintered ceramics revealed that the composite (1 − y)MCoT–yCSLT composed of two phases. The ceramics with the composition (0.8)MCoT–(0.2)CSLT sintered at 1200 °C were observed to bear a good combination of microwave dielectric properties; dielectric constant (e r ) = 26.13, quality factor (Q × f) = 54,820 GHz and temperature coefficient of resonant frequency (τ f ) = −3.9 ppm/°C, and are proposed as a suitable candidate for microwave applications.