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Evidence of interspersed co-existing CaCO3-III and CaCO3-IIIb structures in polycrystalline CaCO3 at high pressure

Published online by Cambridge University Press:  05 July 2018

M. Merlini ,
W. A. Crichton ,
J. Chantel ,
J. Guignard  and
S. Poli
M. Merlini*
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli, 23, 20133 Milano, Italy
W. A. Crichton
Affiliation:
ESRF, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble cedex, France Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
J. Chantel
Affiliation:
ESRF, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble cedex, France
J. Guignard
Affiliation:
ESRF, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble cedex, France
S. Poli
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli, 23, 20133 Milano, Italy
*
E-mail: merlini@unimi.it
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Abstract

New experimental data are reported on high-pressure polymorphism of CaCO3. The CaCO3-III phase was stabilized using a large-volume press device and high-resolution X-ray powder diffraction (XRPD) patterns were collected from a few mm3 of powder sample. The interpretation of XRPD indicates that CaCO3-III and CaCO3-IIIb structures are present simultaneously and are in similar proportions. The lack of any unindexed peaks demonstrates that these two polymorphs are the only phases in this experiment, indicating that CaCO3-III and CaCO3-IIIb are the structures most likely to occur above 2.5 GPa. Relevant co-axial crystallographic matrix transformations from lower-pressure polymorphs to both CaCO3-III and CaCO3-IIIb are discussed to illustrate a further possible occurrence of co-existing and interspersed stable polymorphs in carbonate systems.

Keywords

CaCO3polycrystallinehigh pressure
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 2 , April 2014 , pp. 225 - 233
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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Footnotes

Current address: Laboratoire Magmas et Volcans, Université Blaise Pascal - OPGC − CNRS, 5, Rue Kessler, 63038 Clermont-Ferrand Cedex, France

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