• journal_title：American Mineralogist
• Contributor：Anastasia Kantor ; Innokenty Kantor ; Marco Merlini ; Konstantin Glazyrin ; Clemens Prescher ; Michael Hanfland ; Leonid Dubrovinsky
• Publisher：Mineralogical Society of America
• Date：2012-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2012.4103
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：97
• issue：10
• firstpage：1764
• section：Articles

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 ų. An analysis of the crystal strains suggest that the non-hydrostatic stresses can be considered as negligible even at the highest pressure reached.