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Variable temperature and pressure study of the Raman spectrum of five phases of HgI 2
Author(s) -
Khilji M. Y.,
Sherman W. F.,
Stadtmuller A.,
Wilkinson G. R.
Publication year - 1981
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.1250110405
Subject(s) - raman spectroscopy , phase diagram , chemistry , phase boundary , analytical chemistry (journal) , phase transition , anomaly (physics) , orange (colour) , atmospheric temperature range , spectral line , phase (matter) , thermodynamics , condensed matter physics , physics , optics , organic chemistry , astronomy , food science
Raman spectra of red and yellow forms of HgI 2 have been recorded as a function of temperature and pressure. Temperatures between 77 and 570 K and pressures up to 14 khar have been used to investigate the vibrational modes of four (and possibly five) phases of this material. No evidence could be found from the Raman spectrum to support the suggestion that a thermal anomaly within the stability range of the red form indicates a III to IV transition. Clear differentiation between the yellow high temperature and high pressure phases has been shown, and the phase boundary ( Y HP → Y HT ) located. A previously unreported Raman spectrum of an orange phase is shown, and a modified phase diagram is presented.