RAMAN-SCATTERING IN FERROELECTRIC (CH3NH3)3BI2BR9 SINGLE-CRYSTALS

Authors
MINIEWICZ A JAKUBAS R ECOLIVET C GIRARD A
Citation
A. Miniewicz et al., RAMAN-SCATTERING IN FERROELECTRIC (CH3NH3)3BI2BR9 SINGLE-CRYSTALS, Journal of Raman spectroscopy, 25(5), 1994, pp. 371-375
Citations number
20
Categorie Soggetti
Spectroscopy
Journal title
Journal of Raman spectroscopy → ACNP
ISSN journal
03770486
Volume
25
Issue
5
Year of publication
1994
Pages
371 - 375
Database
ISI
SICI code
0377-0486(1994)25:5<371:RIF(S>2.0.ZU;2-4
Abstract
The Raman spectra of ferroelectric (CH3NH3)3Bi2Br9 single crystals wer e studied at temperatures from 80 to 300 K and in the wavenumber range 0-300 cm-1. A tentative assignment of the observed bands is proposed. The phase transitions reported at 188, 140 and 101.5 K influence the Raman spectra and the observed changes are discussed in terms of the p ossible mechanisms involved. The lowest phase transition at 101.5 K is directly connected with instability of the inorganic sublattice.