Phase evolution and ferroelectric behavior in BaTiO3-BiScO3-PbTiO3 ceramics

Phase evolution and ferroelectric behavior in 0.8BaTiO3-(0.2-x) BiScO3-xPbTiO3 ceramics, x = 0-0.20, has been investigated in this paper. The phase assemblage and lattice parameters indicate the appearance of tetragonal-rhombohedral phase transition and the existence of a MPB region in the composition range x = 0.15-0.20. All these compositions exhibit relaxor ferroelectric behavior due to cation disorder for the substitution on the A-site by Bi and on the B-site by Sc. The dielectric permittivity of the specimens as well as the polarization decreases with increasing BiScO3. However, close to MPB region, the composition with dominance of rhombohedral phase (x = 0.15) exhibits higher remnant polarization than that with tetragonal for the more reorientational directions of the rhombohedral phase than that of the tetragonal one (x = 0.17).