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Vibrational spectroscopy at high pressures: 44—thallous carbonate
Author(s) -
Adams D. M.,
Hatton P. D.,
Taylor I. D.
Publication year - 1983
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.1250140304
Subject(s) - raman spectroscopy , orthorhombic crystal system , chemistry , carbonate , infrared spectroscopy , analytical chemistry (journal) , spectroscopy , crystal (programming language) , spectral line , infrared , phase (matter) , crystal structure , crystallography , optics , physics , organic chemistry , programming language , quantum mechanics , astronomy , computer science
Raman spectra of thallous carbonate have been studied to c. 52 kbar and mid‐IR spectra to 36 kbar. Details of the assignment have also been established using single‐crystal IR reflectance and Raman spectroscopy. Phase transitions were found near 13 and 38 kbar on the basis of the Raman evidence, thus supporting the earlier conclusions of Meisalo and Kalliomaki based on x‐ray powder and optical results. Analysis of possible space group relations between phases III (ambient) and IV showed that IV must be orthorhombic and adopt one of the D 2 h ngroups, where n = 17, 19, 21, 25 or 28. Structural relationships between the phases are discussed.