Raman spectroscopic study of PbCO(3) at high pressures and temperatures

Minch, R., Dubrovinsky, L., Kurnosov, A., Ehm, L., Knorr, K. and Depmeier, W. (2010) Raman spectroscopic study of PbCO(3) at high pressures and temperatures Physics and Chemistry of Minerals, 37 (1). pp. 45-56. DOI 10.1007/s00269-009-0308-0.

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Cerussite (PbCO(3)) has been investigated by high-pressure and high-temperature Raman spectroscopy up to pressures of 17.2 GPa and temperatures of 723 K. Two pressure induced phase transitions were observed at about 8.0(2) and 16.0(2) GPa, respectively. The post-aragonite transition (PbCO(3)-II) at 8.0(2) GPa is accompanied by softening of the v (2)-out-of-plane mode of the CO (3) (2-) group and disappearance of the B(1g) (v (4)-in-plane band of the CO (3) (2-) group) mode. Stronger shifts of the carbonate group modes after the phase transition suggest that the new structure is more compressible. The formation of a second high-pressure polymorph begins at about 10 GPa. It is accompanied by the occurrence of three new bands at different pressures and splitting of the v (1)-symmetric C-O stretching mode of the CO (3) (2-) group. The transitions are reversible on pressure release. A semi-quantitative phase diagram for PbCO(3) as a function of pressure and temperature is proposed.

Document Type: Article
Keywords: Cerussite Raman spectroscopy High pressure High temperature Phase transition post-aragonite phase crystal-structure earths mantle caco3 storage transition stability carbonate cerussite spectra
Research affiliation: Kiel University
DOI etc.: 10.1007/s00269-009-0308-0
ISSN: 0342-1791
Date Deposited: 22 Dec 2011 05:36
Last Modified: 08 Oct 2012 10:00
URI: http://eprints.uni-kiel.de/id/eprint/15704

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