High-pressure behavior of otavite (CdCO(3))

Minch, R., Seoung, D. H., Ehm, L., Winkler, B., Knorr, K., Peters, L., Borkowski, L. A., Parise, J. B., Lee, Y., Dubrovinsky, L. and Depmeier, W. (2010) High-pressure behavior of otavite (CdCO(3)) Journal of Alloys and Compounds, 508 (2). pp. 251-257. DOI 10.1016/j.jallcom.2010.08.090.

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The high-pressure, room temperature behavior of otavite (CdCO(3)) was investigated by angle-dispersive synchrotron radiation powder diffraction up to 40 GPa, Raman spectroscopy up to 23 GPa and quantum mechanical calculations based on density functional theory. The calcite-type structure of CdCO(3) is stable up to at least 19 GPa as shown by Raman spectroscopy. The compression mechanism was obtained from structure refinements against the diffraction data. The quantum mechanical calculations propose a calcite-aragonite phase transition to occur at about 30 GPa. The existence of a pressure-induced phase transition is supported by the Raman and diffraction experiments. Evidence for the transformation is given by broadening of X-ray reflections and external Raman bands starting from about 19 GPa in both experiments. (c) 2010 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Inorganic materials Crystal structure and equation-of-state High-pressure X-ray diffraction Optical spectroscopy x-ray-diffraction phase-transition crystal-structure calcite-structure single-crystal lower mantle carbonates temperature compression refinement
Research affiliation: Kiel University
DOI etc.: 10.1016/j.jallcom.2010.08.090
ISSN: 0925-8388
Date Deposited: 22 Dec 2011 05:43
Last Modified: 08 Oct 2012 10:00
URI: http://eprints.uni-kiel.de/id/eprint/15706

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