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Thermodynamics and behavior of γ-Mg2SiO4 at high pressure: Implications for Mg2SiO4 phase equilibrium

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Abstract

Raman spectra of γ-Mg2SiO4 taken to 200 kbar were used to calculate entropy and heat capacity at various P-T conditions. These new thermodynamic data on γ-MgSiO4, similar data on MgSiO3 perovskite (pv), previous data on β-MgSiO4 and MgO (mw), and previous volumetric data of all phases were used to calculate the phase boundaries in the Mg2SiO4 phase diagram. Our resulting slope for the β→γ transition (50±4 bar K-1) is in excellent agreement with recent multi-anvil studies. The slopes for the β→pv+MgO and γ→pv+MgO are-7±3 and -25±4 bar K-1, respectively, and are consistent with our CO2 laser heated diamond anvil studies. These slopes result in a β-γ-MgO+pv triple point at approximately 229 kbar and 2260 K for the iron free system.

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Author notes

  1. T. Ko

    Present address: Department of Ceramic Engineering, College of Engineering, Inha University, 253 Yonghyun-Kong, 402-751, Nam-Gu, Inchon, Republic of Korea

Authors and Affiliations

  1. Max Planck Institut für Chemie, Postfach 3060, D-55020, Mainz, Germany

    A. Chopelas & R. Boehler

  2. Department of Earth and Space Sciences, State University of New York at Stony Brook, Mineral Physics Institute, 11794, Stony Brook, New York, USA

    T. Ko

Authors
  1. A. Chopelas
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  2. R. Boehler
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  3. T. Ko
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Chopelas, A., Boehler, R. & Ko, T. Thermodynamics and behavior of γ-Mg2SiO4 at high pressure: Implications for Mg2SiO4 phase equilibrium. Phys Chem Minerals 21, 351–359 (1994). https://doi.org/10.1007/BF00203293

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  • DOI: https://doi.org/10.1007/BF00203293

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