Influence of Calcium Doping on the Physical, Microstructural, and Electrical Characteristics of Sr1–xCaxTiO3 Ceramics

The strontium calcium titanate (Sr1–xCaxTiO3) ceramics have been synthesized using the solid-state reaction method. Sr1–xCaxTiO3 ceramics are sintered at 1300°C for 3 h. The X-ray diffraction confirmed perovskite tetragonal strontium calcium titanate ceramics. It is found that with the increase of calcium content in Sr1–xCaxTiO3 the unit cell volume and density decrease. The microstructure of strontium calcium titanate is examined using field emission scanning electron microscopy it is found that with the addition of calcium, the average grain size has increased for all compositions of Sr1–xCaxTiO3 ceramics. Porosity is decreased with the addition of calcium in Sr1–xCaxTiO3 ceramics. The variation of relative permittivity (ɛr) and loss tangent (tanδ) with temperature in Sr1–xCaxTiO3 ceramics was observed to remain constant up to 200°C and beyond this temperature ɛr and tan δ enhanced with a rise in Calcium content.