Dynamic Evolution of Polar Regions in KTa_0.56Nb_0.44O₃ near the Para-Ferroelectric Phase Transition

Abstract

The evolution of domains, which reveals the special structure in the vicinity of the para-ferroelectric phase transition, is the key to explaining the excellent properties of ferroelectric materials. However, although existing studies offer insight into the process of the para-ferroelectric phase transition, questions remain regarding the intermediate structure in the order–disorder state. To investigate this phenomenon, we studied the stability and intensity of polarization for the temperature-dependent microstructure, deduced from the vibrations of ions. The evolution of polarization and orientation in the polar regions is investigated through the vibrations of the deformation of the octahedral units. In addition, the intensity and full width at half-maximum (fwhm) of the B1+E(3TO) mode revealed the stability of polar regions in the dynamic process, which differentiates the static state and dynamic state. Such findings will have a significant impact in the field of property manipulation.