A central peak in light scattering from the relaxor-type ferroelectric Na <SUB>1/2</SUB>Bi <SUB>1/2</SUB>TiO <SUB>3</SUB> - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Physica B: Condensed Matter Year : 2001

A central peak in light scattering from the relaxor-type ferroelectric Na 1/2Bi 1/2TiO 3

E. Husson
  • Function : Author
  • PersonId : 790399
  • IdRef : 132778823
S. G. Lushnikov
  • Function : Author
E. A. Rogacheva
  • Function : Author
P. P. Syrnikov
  • Function : Author

Abstract

A complex perovskite-type single crystal Na 1/2Bi 1/2TiO 3 (NBT) has been studied by Raman scattering. A broad central component has been revealed to analyze the temperature dependence of its intensity and width for the first time. The central component has features of a relaxation mode with the highest intensity in the intertransition 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 under normal conditions as in PbMg 1/3Nb 2/3O 3 (PMN).

Dates and versions

insu-03618069 , version 1 (24-03-2022)

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I. G. Siny, E. Husson, J. M. Beny, S. G. Lushnikov, E. A. Rogacheva, et al.. A central peak in light scattering from the relaxor-type ferroelectric Na 1/2Bi 1/2TiO 3. Physica B: Condensed Matter, 2001, 293, pp.382-389. ⟨10.1016/S0921-4526(00)00549-4⟩. ⟨insu-03618069⟩
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