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Raman spectroscopic study of spodumene (LiAlSi 2 O 6 ) through the pressure‐induced phase change from C 2/ c to P 2 1 / c
Author(s) -
Pommier C. J. S.,
Denton M. B.,
Downs R. T.
Publication year - 2003
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.1051
Subject(s) - raman spectroscopy , spodumene , chemistry , analytical chemistry (journal) , phase transition , pyroxene , high pressure , phase (matter) , crystallography , mineralogy , olivine , thermodynamics , optics , ceramic , physics , organic chemistry , chromatography
High‐pressure Raman spectroscopy was used to follow the effects of a phase transition on the Raman spectrum of a natural specimen of the pyroxene spodumene, from its low‐pressure ( C 2/ c ) to its high‐pressure ( P 2 1 / c ) phases. The transition occurred at 3.2 GPa and was accompanied by an increase from 15 to 23 observed peaks, owing to a decrease in symmetry. Comparisons were made with other pyroxenes with the same space groups. The change in Raman shift with pressure of all peaks observed is reported. An additional change in the spectrum is observed between 7.7 and 8.9 GPa, possibly due to the formation of an additional bond between Li and O3 or some other transition that retained the mineral's P 2 1 / c space group. Splitting of the peak appearing at ∼700 cm −1 , used to characterize the P 2 1 / c phase in other studies, was not observed. Copyright © 2003 John Wiley & Sons, Ltd.