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Structural phase transition in (n‐C 4 H 9 NH 3 ) 2 SiF 6 : DSC and Raman studies
Author(s) -
Jeghnou H.,
Ouasri A.,
Rhandour A.,
Dhamelincourt M.C.,
Dhamelincourt P.,
Mazzah A.
Publication year - 2003
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.964
Subject(s) - differential scanning calorimetry , raman spectroscopy , phase transition , chemistry , trigonal crystal system , crystallography , analytical chemistry (journal) , phase (matter) , calorimetry , space group , crystal structure , x ray crystallography , thermodynamics , diffraction , physics , organic chemistry , chromatography , optics
Butylammonium hexafluorosilicate, (n‐C 4 H 9 NH 3 ) 2 SiF 6 , crystallizes at room temperature in the trigonal system with a probable space group P 321. A new structural phase transition was detected at low temperatures for this compound by means of differential scanning calorimetry (DSC) and the basic thermodynamic data for this transition were determined. The internal vibrational modes of (n‐C 4 H 9 NH 3 ) 2 SiF 6 were studied at ambient temperature and as a function of the temperature, through the phase transition, by means of Raman spectroscopy. The observed phase transition is associated with the dynamics of the system and is of the order–disorder type. Copyright © 2003 John Wiley & Sons, Ltd.