High-pressure Raman spectroscopic studies of FeS2 pyrite

A. K. Kleppe, A. P. Jephcoat

Research output: Contribution to journalArticle

73 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
Externally publishedYes

Fingerprint

pyrite
diamond anvil cell
Helium
Diamond
shock wave
phase transition
hydrostatics
helium
contraction
Shock waves
X-ray diffraction
compression
Phase transitions
X ray diffraction
temperature

Keywords

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

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

High-pressure Raman spectroscopic studies of FeS2 pyrite. / Kleppe, A. K.; Jephcoat, A. P.

In: Mineralogical Magazine, Vol. 68, No. 3, 06.2004, p. 433-441.

Research output: Contribution to journalArticle

Kleppe, A. K. ; Jephcoat, A. P. / High-pressure Raman spectroscopic studies of FeS2 pyrite. In: Mineralogical Magazine. 2004 ; Vol. 68, No. 3. pp. 433-441.
@article{837bbe2a2ea74d129d7da5fb7d48fbeb,
title = "High-pressure Raman spectroscopic studies of FeS2 pyrite",
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.",
keywords = "Diamond-anvil cell, FeS, High pressure, Pyrite, Raman spectroscopy",
author = "Kleppe, {A. K.} and Jephcoat, {A. P.}",
year = "2004",
month = "6",
doi = "10.1180/0026461046830196",
language = "English",
volume = "68",
pages = "433--441",
journal = "Mineralogical Magazine",
issn = "0026-461X",
publisher = "Mineralogical Society",
number = "3",

}

TY - JOUR

T1 - High-pressure Raman spectroscopic studies of FeS2 pyrite

AU - Kleppe, A. K.

AU - Jephcoat, A. P.

PY - 2004/6

Y1 - 2004/6

N2 - 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.

AB - 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.

KW - Diamond-anvil cell

KW - FeS

KW - High pressure

KW - Pyrite

KW - Raman spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=4444247012&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4444247012&partnerID=8YFLogxK

U2 - 10.1180/0026461046830196

DO - 10.1180/0026461046830196

M3 - Article

VL - 68

SP - 433

EP - 441

JO - Mineralogical Magazine

JF - Mineralogical Magazine

SN - 0026-461X

IS - 3

ER -