Existence of Multi Crystallographic phase in BNT-BTO solid solution near Morphotropic Phase boundary (MPB)

摘要

Lead free Bismuth sodium titanate (BNT) base solid solutions are focusing intensively due to their potential applications as an alternative for Pb-base compounds. In this work, Solid solutions of BNT and barium titanate [(1-x) BNT + x BTO with x=0.00, 0.06, 1.00] have been prepared via conventional solid state route by using the planetary ball mill method. Crystallinity of the samples characterized by XRD and various structural parameters are calculated by employing Rietveld refinement technique. The distinct peak (002/200) splitting around 46° to 47° confirmed the presence of both rhombohedral and tetragonal phase in the solid solution. Dielectric constant of the solid solution near the morphotropic phase boundary (x=0.06) is significantly enhanced as compared to BNT and BTO. The electrical conductivity of the solid solution was found to reduce w.r.t to BNT. The above results indicate the possible application of BNT- BTO solid solution near MPB in the field of energy storage.