The boundary phase and the melting of CaSiO3 and MgSiO3 perovskites

Z. Wang*, W. L. Griffin, S. Y. O'Reilly, H. Zheng, H. Mao

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    We have investigated the melting temperatures of MgSiO3 and CaSiO3 perovskites at high pressure conditions, using an empirical melting equation, combined with the assumption of a boundary phase existing at the melting point. This study indicates that both CaSiO3 and MgSiO3 perovskites have a cubic structure near the melting boundary, and that the obtained melting temperatures are in good agreement with experimental measurements (Zerr et al., Geophys. Res. Lett. 24 (1998) 909; J.S. Sweeney, D.L. Heinz, High Pressure-Temperature Research: Properties of Earth and Planetary Materials, in: M.H. Manghnani, T. Yagi (Eds.), AGU, (1998) p. 185]. Additionally, our results reveal that CaSiO3 and MgSiO3 perovskites cannot cause a partial melting at the core-mantle boundary. Our calculation and assumption suggest that the Lindemann law is valid to estimate the melting temperatures of silicates as the silicate phases near the melting boundary are definitely determined and chosen.

    Original languageEnglish
    Pages (from-to)1815-1820
    Number of pages6
    JournalJournal of Physics and Chemistry of Solids
    Volume61
    Issue number11
    Publication statusPublished - Nov 2000

    Keywords

    • C. High pressure
    • D. Phase transitions
    • D. Thermodynamic properties

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