High-pressure Raman spectroscopic studies of FeS2 pyrite

A. K. Kleppe, A. P. Jephcoat

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    89 Citations (Scopus)

    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 Raman-active 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.

    Original languageEnglish
    Pages (from-to)433-441
    Number of pages9
    JournalMineralogical Magazine
    Volume68
    Issue number3
    DOIs
    Publication statusPublished - Jun 2004

    Keywords

    • Diamond-anvil cell
    • FeS
    • High pressure
    • Pyrite
    • Raman spectroscopy

    ASJC Scopus subject areas

    • Geochemistry and Petrology

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