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Pressure Raman spectra of LiK 0.8 (NH 4 ) 0.2 SO 4
Author(s) -
Teixeira A. M. R.,
Freire P. T. C.,
Sasaki J. M.,
Mendes Filho J.,
Melo F. E. A.,
Lemos V.
Publication year - 2001
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.726
Subject(s) - raman spectroscopy , chemistry , spectral line , analytical chemistry (journal) , phase (matter) , wavenumber , phase transition , mineralogy , optics , physics , condensed matter physics , organic chemistry , chromatography , astronomy
Raman spectra of LiK 0.8 (NH 4 ) 0.2 SO 4 were obtained as a function of applied pressure. The measurements were carried out using a microscope to focus the light into a spot size of 2 µm, in order to avoid probing a multi‐domain sample. With increasing pressure, many of the Raman peaks are shifted towards higher wavenumbers. At certain pressures the number of peaks changes and the ˜ν vs P plots are discontinuous. These effects occurring at P = 0.9 and 2.5 GPa were interpreted as structural phase transitions. The pressure coefficients are given for modes derived from the pure E 2 and A (LO) symmetries of α‐phase. Copyright © 2001 John Wiley & Sons, Ltd.