Protoenstatite in MgSiO3 samples prepared by conventional solid state reaction

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    3 Citations (Scopus)

    Abstract

    Enstatite (MgSiO3) sample was prepared by conventional solid state reaction at 1500 °C, followed by cooling to ambient temperature with different cooling rates (0.04-500 °C/s). Quantitative analysis of enstatite phases in the samples by Rietveld refinement and 29Si MAS NMR revealed that a large amount of metastable protoenstatite (30-40 mol%) along with clinoenstatite was preserved in all samples. The presence of protoenstatite was also confirmed by micro-Raman spectroscopy. The crystal structures of protoenstatite and clinoenstatite at room temperature were refined using the Rietveld method, and were essentially the same as those reported by previous studies. As the solid state reaction method is commonly used to prepare synthetic clinoenstatite, the present result implies that the 'clinoenstatite' starting materials used in previous phase equilibrium studies of MgSiO3 pyroxene might contain overlooked protoenstatite, which could affect the interpretation for phase transition and thus those results should be reexamined.

    Original languageEnglish
    Pages (from-to)359-364
    Number of pages6
    JournalJournal of Mineralogical and Petrological Sciences
    Volume112
    Issue number6
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Clinoenstatite
    • Crystal structure
    • MgSiO
    • Phase relation
    • Protoenstatite

    ASJC Scopus subject areas

    • Geophysics
    • Geology

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