Investigation of x-bismuth(B')ozone-(1-x)lead titanate and x-bismuth(B',B'')ozone-(1-x)lead titanate perovskite solid solutions with high transition temperatures.

摘要

Perovskite solid solutions xBiInO3-(1 - x)PbTiO3, (BI-PT), xBiLaO3-(1 - x)PbTiO3 (BL-PT), and complex xBi(B', B")O3-(1 - x)PbTiO3 (where B' and B" refer to 3+ cations) were fabricated using conventional ceramic processing. The extent of Bi(B')/(B'B")O3 substitution in the perovskite system and the corresponding shifts in the transition temperatures were investigated using thermal analysis, dielectric measurements, x-ray diffraction, and electron microscopy.;For BI-PT system, maximum tetragonal perovskite distortion ( c/a = 1.082) was obtained for x = 0.20, with a corresponding Curie temperature of 582°C. Nb modified BI-PT system with increased high temperature resistivity was evaluated for its transition temperature as well as electromechanical properties. BL-PT system showed reduced tetragonality and exhibited unique high temperature dielectric properties. Complex xBi(B', B")O3-(1 - x )PbTiO3 solid solutions showed multiple dielectric constant peaks which were attributed to possible large cation (e.g. La3+, In3+, etc.) substitution into B-sites in the perovskite lattice.