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Raman spectrum of NH 4 ReO 4 at high pressure
Author(s) -
Klug D. D.,
Sim P. G.,
Brown R. J. C.
Publication year - 1982
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.1250130110
Subject(s) - raman spectroscopy , chemistry , bending , lattice (music) , ion , phase transition , spectral line , translational symmetry , crystal structure , single crystal , crystallography , molecular physics , nuclear magnetic resonance , materials science , condensed matter physics , optics , physics , organic chemistry , astronomy , acoustics , composite material
The pressure dependences at room temperature of the translational lattice modes and of the ν 2 and ν 4 internal bending modes of the ReO 4 −ion in solid NH 4 ReO 4 are reported. There is no evidence of any phase transition up to a pressure of 15 kilobar. The pressure coefficients of the translational modes are 2.0 cm −1 GPa −1 and 3.0 cm −1 GPa −1 for the B g and E g modes respectively. The pressure coefficients of the bending modes are 1.0 cm −1 GPa −1 and 5.4 cm −1 GPa −1 for the B g and A g components of ν 2 , and 4.1 cm −1 for the overlapped B g and E g components of ν 4 . The symmetry assignments of the low frequency lines in the spectrum were checked by means of polarized Raman spectra of a single crystal. The previous assignments are correct.