Journal of the American Ceramic Society, Vol.103, No.4, 2859-2867, 2020
Re-entrant dipole glass-like behavior and lattice dynamics of 0.65Bi(Mg1/2Ti1/2)O-3-0.35PbTiO(3)
The 0.65Bi(Mg1/2Ti1/2)O-3-0.35PbTiO(3) (0.65BMT-0.35PT) ceramic, nearby morphotropic phase boundary (MPB), between tetragonal and rhombohedral was prepared. Dielectric permittivity dependence of temperature exhibits a re-entrance dipole glass-like behavior near room temperature. The behavior was described by the Vogel-Fulcher law and the new glass model. Furthermore, a phenomenological statistical model was employed to determine the distribution of clusters dependence of temperature. The lattice dynamics of the 0.65BMT-0.35PT ceramic was estimated by Raman spectroscopy from 298-723 K. A disruption of ferroelectric long-range order and an occurrence of local lattice distortion were revealed. The relaxor-ferroelectric (r-FE) nature of the 0.65BMT-0.35PT was characterized by polarization-electric field P(E). A close relation between the distribution of clusters and ferroelectric properties was established.