Influence of Pr dopant on the dielectric properties and Curie temperatures of Ba_(1-3x)Pr_(2x)Ti_(0.95)Sn_(0.05)O_3 (0.01 ≤ x ≤ 0.05) ceramics

摘要

Three perovskite-structured ceramic phases Ba_(1-3x)Pr_(2x)Ti_(0.95)Sn_(0.05)O_3 (BPTS-x) with x = 0.01, 0.03, and 0.05 have been synthesized by solid-state reaction method. Obtained BPTS-x ceramics were investigated by X-ray diffraction and dielectric properties measurements. Analysis of all the ceramic samples using X-ray diffraction method at room temperature and its Rietveld refinement inferred rhombohedric structure with the space group R(3)c. The temperature variation of real permittivity gives evidence of the ferroelectric phase transition and of the relaxation behavior. With increasing Pr concentration, the degree of diffuse phase transition was enhanced, and a linear reduction in the transition temperature was produced. The conductivity spectra have been investigated by the Jonscher universal power law (σ(ω) = σ_(dc) + Aω~s) and attributed to hopping conduction mechanism.