Synthesis, structural and dielectric properties of Magnesium calcium titanate (1-x)MgTiO3-xCaTiO3 (x=0, 0.1, 0.2 and 0.3)

Abstract

Magnesium Titanate-based ceramics is one of the popular microwave dielectric materials. These are widely used as dielectrics in resonators and filters for communication, capacitors and radar systems operating at microwave frequencies. The pure and Calcium doped Magnesium Titanate ceramic materials are synthesised by conventional Solid-state route diffusion method. High purity chemicals of MgO, TiO2 and CaO which are taken in according to their compositions for the preparation of Mg1-xCaxTiO3 (x=0,0.1,0.2 and 0.3) ceramics. They are grounded well for 12h in a Ball Mill. Then the powders are calcined at 1175°C to 1200°C for 36h and are pressed into pellets. These pellets are sintered at 1270°C to 1300°C for 6h. The dielectric constant from room temperature to 350°C is calculated using HIOKI 3532-50 LCR HiTESTER in the frequency range of 100Hz-5MHz. The dielectric constant at room temperature at a frequency of 0.1KHz for pure Magnesium Titanate is found to be 14.13 and as the concentration of Calcium increases dielectric constant increases. The AC conductivity and Dielectric loss of the samples are measured. XRD studies revealed that the compound exhibits major phase of MgTiO3 with Hexagonal structure and space group 148: R-3.