Structural, Electrical, and Microstructural Properties of Barium Strontium Titanate Ceramics

The barium strontium titanate (Ba_1–xSr_xTiO₃) ceramics have been synthesized using the solid-state reaction method. Ba_1–xSr_xTiO₃ ceramics are sintered at 1000°C for 3 h. The X-ray diffraction confirmed perovskite tetragonal barium strontium titanate ceramics. It is found that with the increase of strontium content in Ba_1–xSr_xTiO₃ the unit cell parameters, dielectric loss decreased. The microstructure of barium strontium titanate is examined using field emission scanning electron microscopy it is found that with the addition of strontium, the average grain size has decreased for all compositions of Ba_1–xSr_xTiO₃ ceramics. Curie temperature is decreased with the addition of strontium in Ba_1–xSr_xTiO₃ ceramics. The variation of relative permittivity (ɛ_r) and loss tangent (tanδ) with temperature of Ba_1–xSr_xTiO₃ ceramics was studied.