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Raman intensities near gypsum–bassanite transition in natural gypsum
Author(s) -
Prasad P. S. R.
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(199908)30:8<693::aid-jrs434>3.0.co;2-8
Subject(s) - gypsum , raman spectroscopy , phase transition , analytical chemistry (journal) , chemistry , mineralogy , range (aeronautics) , atmospheric temperature range , intensity (physics) , materials science , optics , condensed matter physics , thermodynamics , physics , metallurgy , composite material , chromatography
The phase transition sequence of natural gypsum (CaSO 4 · 2H 2 O) was studied by Raman spectroscopy in the temperature range 300–550 K. The reduced peak intensity of the symmetric stretching mode around 1008 cm −1 varied anomalously during the gypsum–bassanite transition. From the spectral variations of this mode in the temperature range 300–415 K, the order parameter exponent β was estimated to be 0.46 ± 0.07. Copyright © 1999 John Wiley & Sons, Ltd.