Microstructure and Dielectric Properties of Yttrium-Doped BaSn0.05Ti0.95O3 Ceramics

The microstructure and dielectric properties of Y3+-doped BaSn0.05Ti0.95O3 (BTS5) ceramics were investigated. All BTS5 ceramics possess a single phase with a perovskite structure, and the Rietveld analysis further shows that the material exhibits tetragonal structure with space group P4mm. The amount of Y2O3 can greatly affect the dielectric properties of BTS5. The Curie peak of the blank sample is the highest, and the Curie peak of the samples is obviously suppressed after the doping of Y3+, and the dielectric maximum decreased up to 0.05 mol.% of Y3+ doping and then increased beyond 0.05 mol.% of Y2O3. Due to the amount of doping of Y3+ ions, the lattice distortion is decreased with the increase of Y3+ concentration, which decreases the short-range harmonic restoring force, so Tc shifts to a higher temperature in Y3+ doped BTS ceramics. In addition, the dielectric losses of 0.05–0.6 mol.% Y3+-doped BTS5 ceramics are very stable with the increasing environmental temperature, making them superior candidates for applications.