RAMAN-SCATTERING IN A(3)B(2)C(9) FERROELECTRIC-CRYSTALS

Authors
VALAKH MY LISITSA MP TRILIS AV YAREMKO AM PERESH EY
Citation
My. Valakh et al., RAMAN-SCATTERING IN A(3)B(2)C(9) FERROELECTRIC-CRYSTALS, Physics of the solid state, 39(8), 1997, pp. 1289-1291
Citations number
15
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physics of the solid state → ACNP
ISSN journal
10637834
Volume
39
Issue
8
Year of publication
1997
Pages
1289 - 1291
Database
ISI
SICI code
1063-7834(1997)39:8<1289:RIAF>2.0.ZU;2-F
Abstract
Raman spectra of some A(3)B(2)C(9) ferroelectric crystals (here A = Cs , Rb; B = Sb, Bi; C = Br) have been obtained, and a number of high-fre quency bands have been assigned. The Rb3Bi2Br9 and Rb3Sb2Br9 crystals are shown to differ in structure from Cs2Bi2Br9 The qualitative change s in the spectra in the 77-300 K temperature interval can be associate d not only with structural phase transitions, but with the effect of t he anharmonic Fermi resonance between one- and two-phonon excitations as well. (C) 1997 American Institute of Physics.