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 language | English (US) |
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Pages (from-to) | 890-893 |
Number of pages | 4 |
Journal | American Mineralogist |
Volume | 77 |
Issue number | 7-8 |
State | Published - 1992 |
ASJC Scopus subject areas
- Geophysics
- Geochemistry and Petrology