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

Shigehiko Tateno, Tetsuya Komabayashi, Kei Hirose, Naohisa Hirao and Yasuo Ohishi
Static compression of B2 KCl to 230 GPa and its P-V-T equation of state
American Mineralogist (May 2019) 104 (5): 718-723

Abstract

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-Gruneisen-Debye model for thermal pressure. The thermal pressure of KCl was found to be as small as approximately 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.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 104
Serial Issue: 5
Title: Static compression of B2 KCl to 230 GPa and its P-V-T equation of state
Affiliation: Tokyo Institute of Technology, Earth-Life Science Institute, Tokyo, Japan
Pages: 718-723
Published: 201905
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 31
Accession Number: 2019-048648
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: University of Edinburgh, GBR, United KingdomUniversity of Tokyo, JPN, JapanJapan Synchrotron Radiation Research Institute, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201925
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