Structural and electronic evolution of Cr[subscript 2]O[subscript 3] on compression to 55 GPa

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · J. Solid State Chem.

DOI:https://doi.org/10.1016/j.jssc.2011.09.021· OSTI ID:1028029

Dera, Przemyslaw; Lavina, Barbara; Meng, Yue; Prakapenka, Vitali B. ^[1]

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1. UC

Synchrotron single-crystal x-ray diffraction experiments have been performed on corundum-type Cr{sub 2}O{sub 3} up to a pressure of 55 GPa in Ne and He pressure transmitting media. Diffraction experiments were complemented by measurements of optical absorption spectra with single crystal samples up to 60 GPa. Results of the diffraction data analysis rule out the earlier reported monoclinic distortion at 15-30 GPa, but indicate evidence of two discontinuous transitions of electronic or magnetic nature, most likely associated with a change in magnetic ordering and charge transfer. The compression mechanism established from single crystal refinements indicates much smaller distortion of the Cr{sup 3+} coordination environment than was previously assumed.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: NSF
• OSTI ID: 1028029
• Journal Information: J. Solid State Chem., Journal Name: J. Solid State Chem. Journal Issue: (11) ; 11, 2011 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: ENGLISH