Premium
Fourier transform Raman spectroscopic study of Ba(SO 4 ) x (CrO 4 ) 1− x solid solution
Author(s) -
Alía J. M.,
Edwards H. G. M.,
Fernández A.,
Prieto M.
Publication year - 1999
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(199902)30:2<105::aid-jrs353>3.0.co;2-h
Subject(s) - raman spectroscopy , chromate conversion coating , chemistry , ion , barium , solid solution , analytical chemistry (journal) , inorganic chemistry , crystallography , chromium , optics , physics , organic chemistry , chromatography
Ba(SO 4 ) x (CrO 4 ) 1− x solid solution(nature: hashemite) gel‐grown crystals were studiedusing Fourier transform Raman spectroscopy. The complex Ramanspectrum of the end‐member BaCrO 4 was studied indetail by means of bandshape analysis and component fittingprocedures. Important effects of the crystalline field (bothstatic and dynamic) were observed that could explain theevolution of the chromate anion Raman‐active internal modesunder the influence of a second anion. Significant modifications werelikewise detected in the sulphate anion normal modes. The hindranceof the sulphate intermolecular couplings (dynamic effect of thecrystalline field) when chromate anion replaces it in the unitcell could be the cause of the reported observations. It was possibleto propose a qualitative assignment of the observed barium chromateRaman‐active lattice modes by studying the evolution of suchbands with the anion content. The six bands observed in the region80–200 cm −1 of the barium chromate Ramanspectrum can be interpreted as anion libration (one band),chromate anion translational vibrations (two bands) andbarium–oxygen vibrations (three bands). Copyright© 1999 John Wiley & Sons, Ltd.