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Raman studies of structural phase transition in [NH 2 (CH 3 ) 2 ] 3 Sb 2 Cl 9 (DMACA)
Author(s) -
Miniewicz A.,
Lefebvre J.,
Jakubas R.
Publication year - 1991
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/jrs.1250220803
Subject(s) - raman spectroscopy , phase transition , phonon , ferroelectricity , crystal (programming language) , chemistry , analytical chemistry (journal) , line (geometry) , phase (matter) , order (exchange) , crystallography , crystal structure , raman scattering , condensed matter physics , materials science , physics , optics , dielectric , geometry , optoelectronics , mathematics , organic chemistry , computer science , programming language , chromatography , finance , economics
Tris(dimethylammonium) nonachlorodiantimonate (DMACA) is a ferroelectric with a transition temperature T c = 242 K. Low‐frequency Raman spectroscopic studies were carried out on this crystal within the temperature range 100‐300 K to look for possible spectral changes resulting from the phase transition. A detailed analysis of frequencies, line widths and intensities was made through the phase transition in order to understand its nature. It follows from the analysis that pseudo‐spin‐phonon interactions of higher order are effective in this case.