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Raman scattering study of the upper phase transition in CsScF 4
Author(s) -
Vtyurin A. N.,
Bulou A.,
Krylov A. S.,
Shmygol I. V.,
Aleksandrov K. S.
Publication year - 2000
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(200003)31:3<151::aid-jrs510>3.0.co;2-t
Subject(s) - tetragonal crystal system , phase transition , raman scattering , raman spectroscopy , soft modes , phase (matter) , crystal (programming language) , condensed matter physics , crystallography , symmetry (geometry) , materials science , crystal structure , scattering , optics , chemistry , molecular physics , physics , geometry , optoelectronics , mathematics , programming language , organic chemistry , computer science , dielectric , ferroelectricity
Effects of the phase transition between the high‐temperature tetragonal phases of the CsScF 4 crystal were studied by Raman scattering. The appearance of new lines including a soft mode was observed below the phase transition point, in complete accordance with the new crystal symmetry. The behavior of the soft mode, which corresponds to in‐phase rotations of ScF 6 rigid groups around the z ‐axis (and out‐of‐phase within perovskite‐like layers), resembles that observed earlier in RbAlF 4 , which suggests a similar mechanism of this transition in both crystals. Copyright © 2000 John Wiley & Sons, Ltd.