Synthesis and microwave dielectric properties characterization of Ca1-xMgxTiO3 Ceramics

Abstract

Solid solutions of Ca_1-xMg_xTiO₃ (0 ≤ x ≥ 0.8) were prepared via conventional solid state route. The microwave dielectric properties and density of the fabricated samples were measured. The X-ray diffraction (XRD) patterns revealed single phase perovskite structured CaTiO₃ and no impurity phase. The SEM images indicated dense ceramic with no pores and round shape grain morphology. The dielectric constant (É›_r) increased to 124.43 with Mg²⁺ doping and maximum dielectric constant was observed for Ca_0.8Mg_0.2TiO₃ while the quality factor (Q×f_o) of Ca_0.4Mg_0.6TiO₃ reaches to 2000 MHz whereas pure CaTiO₃ posses relatively smaller (Q×f₀) equal to 1333.33 MHz. Indicated that dielectric constant is directly proportional to the density of samples. All measurements are taken at room temperature for relatively lower frequency of 2 MHz.