Physics – Condensed Matter – Materials Science
Scientific paper
2003-01-25
Physics
Condensed Matter
Materials Science
11 pages, 8 figures
Scientific paper
10.1103/PhysRevB.68.104107
Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ is one of the simplest representatives of the class of lead relaxors and often serves as a model system for more complicated compounds. In this paper we analyse both polarized and depolarized Raman scattering spectra, measured in the temperature range between 1000 and 100 K, by multiple peak decomposition. Basing on this analysis, we present the picture of transformations in the crystal and the nature of the spectral lines. According to our model, the formation of the Fm3m symmetry in the chemically ordered regions as well as the appearance and freezing of the polar nanoregions are the consequences of the same phenomenon: ion off-centered displacements and their reorientational thermal motion. The lowering temperature progressively limits this motion from eight to four, two and only one site. Raman scattering exists due to the presence of the Fm3m and polar clusters. It is a product of the multiphonon interaction process, mediated by the presence of the dynamic and static disorder.
Svitelskiy Oleksiy
Toulouse Jean
Ye Zuo-Guang
No associations
LandOfFree
Polarized Raman study of the phonon dynamics in Pb(Mg$_{1/3}$Nb$%_{2/3} $)O$_{3}$ crystal does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Polarized Raman study of the phonon dynamics in Pb(Mg$_{1/3}$Nb$%_{2/3} $)O$_{3}$ crystal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarized Raman study of the phonon dynamics in Pb(Mg$_{1/3}$Nb$%_{2/3} $)O$_{3}$ crystal will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-496924