Evidence for the existence of a PbCO(3)-II phase from high pressure X-ray measurements

Minch, R., Peters, L., Ehm, L., Knorr, K., Siidra, O. I., Prakapenka, V., Dera, P. and Depmeier, W. (2010) Evidence for the existence of a PbCO(3)-II phase from high pressure X-ray measurements Zeitschrift Fur Kristallographie, 225 (4). pp. 146-152. DOI 10.1524/zkri.2010.1194.

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Abstract

The high-pressure room temperature behavior of PbCO(3) was investigated by angle-dispersive synchrotron powder diffraction up to 16.16(5) GPa. A phase transition to a high-pressure polymorph II of lead carbonate was observed at a pressure of approximately p(c) = 8.7 GPa. Thereby, the symmetry is reduced from orthorhombic Pmcn to monoclinic P12(1)/c1. The cell parameters at p = 8.90(5) GPa are a = 5.101(1) angstrom, b = 8.303(3) angstrom, c = 5.602(2) angstrom, beta = 89.51(4)degrees, Z = 4. The transformation is supposed to be of 2(nd) order.

Document Type: Article
Keywords: High pressure X-ray diffraction Phase transition Lead carbonate post-aragonite phase single-crystal rietveld refinement cerussite strontianite temperature diffraction carbonates transition witherite
Research affiliation: Kiel University
DOI etc.: 10.1524/zkri.2010.1194
ISSN: 0044-2968
Date Deposited: 22 Dec 2011 06:01
Last Modified: 08 Oct 2012 10:00
URI: http://eprints.uni-kiel.de/id/eprint/15705

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