High-pressure structural studies of eskolaite by means of single-crystal X-ray diffraction

Anastasia Kantor 1 , 2 , Innokenty Kantor 2 , Marco Merlini 3 , Konstantin Glazyrin 1 , Clemens Prescher 1 , Michael Hanfland 2  and Leonid Dubrovinsky 1
  • 1 Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
  • 2 European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, CEDEX 9, France
  • 3 Universitа degli Studi di Milano, Dipartimento di Scienze della Terra, Via Botticelli 23, 20133 Milano, Italy

Abstract

The structural behavior of Cr2O3 was investigated up to ~70 GPa using single-crystal X-ray diffraction under a quasi-hydrostatic pressure (neon pressure medium) at room temperature. The crystal structure remains rhombohedral with the space group R3̄c (No. 167) and upon compression the oxygen atoms approach an ideal hexagonal close-packing arrangement. An isothermal bulk modulus of Cr2O3 and its pressure derivative were found to be 245(4) GPa and 3.6(2), respectively, based on a third-order Birch-Murnaghan equation of state and V0 = 288.73 Å3. An analysis of the crystal strains suggest that the non-hydrostatic stresses can be considered as negligible even at the highest pressure reached.

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