Premium
Raman and X‐ray investigations of LiFeSi 2 O 6 pyroxene under pressure
Author(s) -
Pommier Carolyn J. S.,
Downs Robert T.,
Stimpfl Marilena,
Redhammer Günther J.,
Denton M. Bonner
Publication year - 2005
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.1373
Subject(s) - raman spectroscopy , pyroxene , phase transition , phase (matter) , diffraction , analytical chemistry (journal) , chemistry , spodumene , x ray crystallography , diamond anvil cell , crystallography , crystal (programming language) , mineralogy , olivine , optics , condensed matter physics , physics , ceramic , organic chemistry , chromatography , computer science , programming language
In situ Raman spectroscopy at high pressure was utilized to follow the phase transition of a synthetic sample of Li‐aegerine pyroxene (LiFeSi 2 O 6 ) from its low‐pressure ( C 2/ c ) phase to its high‐pressure ( P 2 1 / c ) phase. The phase change occurred between 0.7 and 1 GPa and was accompanied by a change in coordination of the Li atom from 4 to 5, which was confirmed by single‐crystal X‐ray diffraction. This is the first report of the Raman spectrum of Li‐aegerine in the P 2 1 / c phase. As was previously observed with other pyroxenes, additional changes in the Raman spectra were observed at pressures higher than the phase transition, including the splitting of the peak near 700 cm −1 , which has traditionally been utilized to indicate the phase transition. Comparisons with the Raman spectra of spodumene in both symmetries are utilized for a discussion of modes. Copyright © 2005 John Wiley & Sons, Ltd.