Influence of nanoscale regions on Raman spectra of complex perovskites

E. A. Rogacheva

paper

Influence of nanoscale regions on Raman spectra of complex perovskites

arXiv:cond-mat/9907366

Abstract

New approach on interpretation and processing of Raman spectra of complex perovskites is suggested. Raman spectra of $P b M g_{1/3} N b_{2/3} O_{3}$ and are successfully described on the basis of the phonon-confinement model and validity of the method is demonstrated on good agreement of experimentally obtained and computer simulated spectra of another complex perovskite, $B a M g_{1/3} T a_{2/3} O_{3}$ . The study showed that the size of nanoscale regions is a kind of an inborn characteristic of the sample and is not temperature dependent. For $P b S c_{1/2} T a_{1/2} O_{3}$ , two special temperature points, approximately 400 K and 600 K are found from the analysis of the temperature behaviour of obtained mode parameters.

5 pages, 5 figures