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Melting of portlandite up to 6 GPa

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Abstract

 Using the high-pressure differential thermal analysis (HP-DTA) system in a cubic multianvil high-pressure apparatus, we measured the melting points of portlandite, Ca(OH)2, up to 6 GPa and 1000 °C. We detected endothermic behavior at the temperature and pressure conditions of 800 °C and 2.5 GPa, 769 °C and 3.5 GPa, 752 °C and 4.0 GPa, 686 °C and 5.0 GPa, and 596 °C and 6.0 GPa, respectively, due to melting of portlandite. By in situ X-ray studies under pressure, the melting of portlandite was observed at 730 °C and 4.32 GPa and at 640 °C and 5.81 GPa, respectively. Results of both HP-DTA and X-ray studies were consistent within experimental error. The melting is congruent and has a negative Clapeyron slope, indicating that liquid Ca(OH)2 has higher densities than crystalline portlandite in this pressure range.

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Authors and Affiliations

  1. Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, , , , , , JP

    H. Fukui, O. Ohtaka & T. Nagai

  2. Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-0193, Japan, , , , , , JP

    T. Katsura

  3. Japan Synchrotron Radiation Research Institute, Hyogo 678-5198, Japan, , , , , , JP

    K. Funakoshi

  4. Japan Atomic Energy Research Institute, Hyogo 679-5143, Japan, , , , , , JP

    W. Utsumi

Authors
  1. H. Fukui
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  2. O. Ohtaka
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  3. T. Nagai
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  4. T. Katsura
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  5. K. Funakoshi
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  6. W. Utsumi
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Received: 19 June 1999 / Revised, accepted: 11 September 1999

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Fukui, H., Ohtaka, O., Nagai, T. et al. Melting of portlandite up to 6 GPa. Phys Chem Min 27, 367–370 (2000). https://doi.org/10.1007/s002699900065

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  • DOI: https://doi.org/10.1007/s002699900065

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