High-temperature behavior of metastable MgSiO3 perovskite: a Raman spectroscopic study

D. J. Durben, George Wolf

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Abstract

The thermal behavior of metastable magnesium silicate (MgSiO3) perovskite has been investigated with Raman spectroscopy at ambient pressure. No evidence for previously predicted high-temperature crystal phase transformations or soft mode behavior is observed. Thermally induced vitrification of the perovskite to an amorphous phase with Si in tetrahedral coordination begins near 400 K and is complete by 750 K. Irreversible frequency shifts of the perovskite Raman bands accompany the vitrification. Residual Raman shifts of samples thermally cycled into the vitrification region indicate a contraction of the perovskite lattice of up to 0.5% in volume. -from Authors

Original languageEnglish (US)
Pages (from-to)890-893
Number of pages4
JournalAmerican Mineralogist
Volume77
Issue number7-8
StatePublished - Jan 1 1992

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ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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