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.

Abstract

This study investigate the impact of adding calcium titanate (CaTiO₃) to (Mg_0.95 Co_0.05) (Ti_0.95 Sn_0.05)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: (Mg_0.95 Co_0.05) (Ti_0.95 Sn_0.05)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