Abstract
A complex perovskite-type single crystal Na1/2Bi1/2TiO3 (NBT) with a cubic-tetragonal-trigonal sequence of phase transition, ending in a ferroelectric state, has been studied by Raman scattering. In additional to a possible soft mode which softens far below the phase transition, a broad central component has been revealed in a form which let us analyze the temperature dependence of its intensity. The central component has features of a relaxation mode with the highest intensity in the intertransirion region, so it arises from a critical light scattering on fluctuations of two coupled order parameters. The correlations between the central component behaviour, acoustic anomalies and dielectric response as well as their relation to a model with competing interactions are discussed. It is suggested that the broad central peak component in light scattering is characteristic of the relaxor-type ferroelectrics with a sequence of phase transformation irrespective of whether transitions are really observed as in NBT or whether transitions are frustrated at normal conditions as in PbMg1/3Nb2/3O3 (PMN).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
