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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian

IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

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Volume 104, Issue 5


Static compression of B2 KCl to 230 GPa and its P-V-T equation of state

Shigehiko Tateno / Tetsuya Komabayashi
  • School of GeoSciences and Centre for Science at Extreme Conditions, University of Edinburgh, Grant Institute, The King’s Buildings, James Hutton Road, Edinburgh EH9 3FE, U.K.
  • Other articles by this author:
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/ Kei Hirose
  • Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8550, Japan
  • Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
  • Other articles by this author:
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/ Naohisa Hirao / Yasuo Ohishi
Published Online: 2019-04-26 | DOI: https://doi.org/10.2138/am-2019-6779


The pressure-volume-temperature (P-V-T) measurements of the B2 (CsCl-type) phase of KCl were performed at 9–61 GPa/1500–2600 K and up to 229 GPa at room temperature, based on synchrotron X‑ray diffraction measurements in a laser-heated diamond-anvil cell (DAC). The nonhydrostatic stress conditions inside the sample chamber were critically evaluated based on the platinum pressure marker. With thermal annealing by laser after each pressure increment, the deviatoric stress was reduced to less than 1% of the sample pressure even at the multi-megabar pressure range. The obtained P-V-T data were fitted to the Vinet equation of state with the Mie-Grüneisen-Debye model for thermal pressure. The thermal pressure of KCl was found to be as small as ~10 GPa even at 3000 K at any given volume, which is only half of that of common pressure markers (i.e. Pt, Au, or MgO). Such a low-thermal pressure validates the use of a KCl pressure medium as a pressure marker at high temperatures.

Keywords: KCl; equation of state; high pressure; DAC

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About the article

Received: 2018-08-11

Accepted: 2018-11-27

Published Online: 2019-04-26

Published in Print: 2019-05-27

FundingThe synchrotron X‑ray diffraction experiments were performed at BL10XU, SPring-8 (proposal nos. 2012A0087, 2012B0087, and 2013B0087). T.K. was supported by the European Research Council (ERC) Consolidator Grant (no. 647723).

Citation Information: American Mineralogist, Volume 104, Issue 5, Pages 718–723, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2019-6779.

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