Abstract
Relaxor ferroelectrics (1-x%)(Na0.5Bi0.5)TiO3-x%BaTiO3 (NBT-xBT) have been widely studied in recent years for the high electrostrains and special structural features. However, there are some structure evolutions still unclear, such as the transition occurring at the temperature of dielectric frequency dispersion vanishes. Here, in-situ polarized Raman scattering was utilized to investigate the evolutions of the lattice structure induced by temperature and electric field. The Raman-active modes for P4bm NBT-8BT were separated and identified under the framework of group theory. By observing A1 modes, it is found that electric field cannot induce ferroelectric state after the frequency dispersion vanishes, demonstrating a competition between relaxor characteristics and long-range ferroelectric order which evolves with temperature. According to B2 modes, the P4bm-P4mm transition was not observed under extra-high electric fields. This work interpretates the Raman scattering and lattice evolutions of NBT-8BT, and proposes a method to analyze Raman spectrum which is generally applicable to other ferroelectrics.
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