Effect of Calcium Titanate Addition on the Phase, Microstructure, and Microwave Dielectric Properties of (Mg0.95Co0.05) (Ti0.95 Sn0.05)O3 Ceramics Calcined at 1200 °C for 5h.

This study investigate the impact of adding calcium titanate (CaTiO3) to (Mg0.95 Co0.05) (Ti0.95 Sn0.05)O3 ceramics for wireless communication application. The ideal ceramics for these systems must three criteria: a near –zero τf value, a suitable dielectric constant for miniaturization, and an attractive unloaded quality factor (Qufo) for selectivity. The initial ceramics had a high negative τf value, which was improved by adding 6wt% CaTiO3. The samples were synthesized using high- purity oxides and sintered at temperatures between 1325°C and 1425°C. X-ray diffraction (XRD) revealed three phases: (Mg0.95 Co0.05) (Ti0.95 Sn0.05)O3, CaTiO3, and MgTi2O5. The densest sample, sintered at 1400°C, achieved a bulk density of 3.86g/cm3. Results showed that the addition of caTiO3 improved τf by 40 ppm/°C, and increased the dielectric constant (εr) to 19.3. However, it reduced the Qufo value to 128,000 GHz. The final material demonstrated promising microwave dielectric properties