High-temperature behavior of metastable MgSiO3 perovskite

a Raman spectroscopic study

D. J. Durben, George Wolf

Research output: Contribution to journalArticle

57 Citations (Scopus)

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 - 1992

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vitrification
perovskite
Vitrification
Temperature
frequency shift
contraction
phase transformations
magnesium
silicates
Raman spectroscopy
silicate
Phase transitions
shift
crystal
Crystals
crystals

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

High-temperature behavior of metastable MgSiO3 perovskite : a Raman spectroscopic study. / Durben, D. J.; Wolf, George.

In: American Mineralogist, Vol. 77, No. 7-8, 1992, p. 890-893.

Research output: Contribution to journalArticle

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AB - 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

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