Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 184, Issue 11, Pages 3040-3049Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.09.021
Keywords
High pressure; Phase transitions; Optical absorption; Corundum; Ruby; Eskolaite
Funding
- Division of Materials Research, National Science Foundation [NSF-DMR-0521179]
- National Science Foundation
- U.S. Department of Energy
- W.M Keck Foundation
- U.S. Department of Agriculture
- State of Illinois
- CIW
- CDAC
- UNLV
- LLNL through DOE-NNSA, DOE-BES
- DOE-BES [DE-AC02-06CH11357]
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Synchrotron single-crystal x-ray diffraction experiments have been performed on corundum-type Cr2O3 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 Cr3+ coordination environment than was previously assumed. (C) 2011 Elsevier Inc. All rights reserved.
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