Raman spectroscopy of CaIrO3 postperovskite up to 30 GPa

Justin Hustoft, Sang Heon Shim, Atsushi Kubo, Norimasa Nishiyama

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We have measured Raman spectra of the postperovskite (PPv) phase in CaIrO3 up to 30 GPa to constrain the Grüneisen parameter (γ). We identified a total of 4 strong modes between 200 and 650 cm-1, which is in contrast with the Raman spectra of Mn2O3 and MgGeO3-PPV where at least nine different modes have been detected. We found no sign of a phase transition in the Raman spectra of PPvCaIrO3,which supports the stability of the PPv phase up to 30 GPa and room temperature in CaIrO3. The spectroscopic Grüneisen parameter γsp.0 = 1.66-1.72, constrained from our Raman data, is in excellent agreement with the thermodynamic Grüneisen parameter, γth.0 = 1.75 ± 0.05, calculated from recent XRD measurements (Martin et al. 2007) on CaIrO3-PPv synthesized at high pressure and temperature similar to our starting material. Our result suggests that γsp constrained by Raman measurements provides a reasonable estimate on the γth of the PPv phase in CaIrO3.

Original languageEnglish (US)
Pages (from-to)1654-1658
Number of pages5
JournalAmerican Mineralogist
Volume93
Issue number10
DOIs
StatePublished - Oct 2008
Externally publishedYes

Keywords

  • CaIrO
  • Gruneisen parameter
  • Postperovskite
  • Raman sepctroscopy
  • Thermal equation of state

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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