Post-perovskite transformation in germanates using sintered diamond anvils

    Research output: Contribution to journalReview articlepeer-review

    Abstract

    Transformation from perovskite to post-perovskite was observed in MnGeO3 and MgGeO3 in the Kawai-type apparatus equipped with sintered diamond anvils by means of in situ X-ray diffraction method. In MnGeO3, post-perovskite phase was observed at 63.5 GPa and 1233 K. The transition pressure was ∼6 GPa higher than previous report by the laser heated diamond anvil cell experiment. In MgGeO3, we observed the transformation from perovskite to post-perovskite and the reversal transformation under the conditions of 61-64 GPa and 1100-1700 K. The phase boundary was determined to be P (GPa) = 5.2 × 10-3 T (K)+55.2, where P is pressure and T is absolute temperature, which is almost consistent with previous result by diamond anvil experiments. However, reliable pressure standard is needed to determine the boundary precisely.

    Original languageEnglish
    Pages (from-to)254-259
    Number of pages6
    JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
    Volume18
    Issue number3
    DOIs
    Publication statusPublished - 2008

    Keywords

    • Germanates
    • Kawai-type apparatus
    • Post-perovskite
    • Sintered diamond anvil

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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