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High-pressure phase transformation in MnCO3: a synchrotron XRD study

Published online by Cambridge University Press:  05 July 2018

S. Ono
S. Ono*
Affiliation:
Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
*
*E-mail: shigeaki.ono@ucl.ac.uk
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Abstract

The high-pressure behaviour of manganese carbonate was investigated by in situ synchrotron X-ray powder diffraction up to 54 GPa with a laser-heated diamond anvil cell. A phase transition from rhodochrosite to a new structure form was observed at 50 GPa after laser heating. The diffraction pattern of the new high-pressure form was reasonably indexed with an orthorhombic unit-cell with a = 5.361 A, b = 8.591 A and c = 9.743 Å. The pressure-induced phase transition implies a unit-cell volume reduction of ∼5%. This result does not support the direct formation of diamond by dissociation of solid state MnCO3 reported in a previous study. Fitting the compression data of rhodochrosite to a second-order Birch-Murnaghan equation of state (Ko’ = 4) gives K0 = 126(±10) GPa. The c axis of the unit-cell parameter was more compressive than the a axis.

Keywords

MnCO3rhodochrositephase transitionhigh pressurediamond anvil cell
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 1 , February 2007 , pp. 105 - 111
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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Footnotes

†

Current address: Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK

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