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High-pressure Raman spectroscopic studies of FeS2 pyrite

Published online by Cambridge University Press:  05 July 2018

A. K. Kleppe  and
A. P. Jephcoat
A. K. Kleppe
Affiliation:
Department of Earth Sciences University of Oxford, Parks Road, Oxford OX1 3PR, UK
A. P. Jephcoat
Affiliation:
Department of Earth Sciences University of Oxford, Parks Road, Oxford OX1 3PR, UK Diamond Light Source, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
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Abstract

We report micro-Raman spectroscopic studies of FeS2 pyrite in the diamond-anvil cell under hydrostatic and non-hydrostatic conditions to 55 GPa at room temperature. Four out of five Ramanactive modes are resolved with helium as a pressure-transmitting medium to highest pressures. The fifth mode, Tg(2) [377 cm-1], is weak and unresolved lying ∼2 cm-1 from the intense Ag mode [379 cm-1] at 1 bar. We observe an increase in the separation of the Eg [344 cm-1] and Tg(1) [350 cm-1] modes under compression. All observed frequencies increase continuously with increasing pressure showing no evidence for a structural phase transition in accord with both X-ray diffraction and shock-wave studies. The Ag and Tg(1) modes gain significantly in intensity relative to the Eg mode with increasing pressure probably resulting from Raman resonance effects. The Tg(3) mode [430 cm-1] broadens unusually compared to the other pyrite modes with pressure. The Raman data are consistent with a contraction of the S-S and Fe-S bonds under pressure. The main effect of non-hydrostatic conditions on the Raman modes is a strong pressure-induced broadening; the pressure-dependence of the frequencies and relative intensities are not affected within the error of the measurements.

Keywords

FeS2pyriteRaman spectroscopyhigh pressurediamond-anvil cell
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 3 , June 2004 , pp. 433 - 441
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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