Evidence for the existence of a PbCO3-II phase from high pressure X-ray measurements

Robert Minch; Lars Peters; Lars Ehm; Karsten Knorr; Oleg I. Siidra; Vitali Prakapenka; Przemyslaw Dera; Wulf Depmeier

doi:10.1524/zkri.2010.1194

Published by De Gruyter (O) April 16, 2010

Evidence for the existence of a PbCO₃-II phase from high pressure X-ray measurements

Robert Minch , Lars Peters , Lars Ehm , Karsten Knorr , Oleg I. Siidra , Vitali Prakapenka , Przemyslaw Dera and Wulf Depmeier

From the journal Zeitschrift für Kristallographie

https://doi.org/10.1524/zkri.2010.1194

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Abstract

The high-pressure room temperature behavior of PbCO₃ 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 P12₁/c1. The cell parameters at p = 8.90(5) GPa are a = 5.101(1) Å, b = 8.303(3) Å, c = 5.602(2) Å, β = 89.51(4)°, Z = 4. The transformation is supposed to be of 2^nd order.

Keywords: High pressure; X-ray diffraction; Phase transition; Lead carbonate

^* Correspondence address: Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften, 24118 Kiel, robert@min.uni-kiel.de

Published Online: 2010-04-16

Published in Print: 2010-04

Evidence for the existence of a PbCO₃-II phase from high pressure X-ray measurements

Abstract

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