Pressure Raman spectra of LiK 0.8 (NH 4 ) 0.2 SO 4 | Zendy

Teixeira A. M. R. | Zendy; Freire P. T. C. | Zendy; Sasaki J. M. | Zendy; Mendes Filho J. | Zendy; Melo F. E. A. | Zendy; Lemos V. | Zendy

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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.

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