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Synthesis of cubic diamond in the graphite-magnesium carbonate and graphite-K2Mg(CO3)2 systems at high pressure of 9–10 GPa region

Published online by Cambridge University Press:  31 January 2011

T. Taniguchi ,
D. Dobson ,
A. P. Jones ,
R. Rabe  and
H. J. Milledge
T. Taniguchi
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki Tsukuba Ibaraki 305, Japan
D. Dobson
Affiliation:
Department of Geophysical and Geological Science, University College London, Gower Street, London WC1E 6BT, United Kingdom
A. P. Jones
Affiliation:
Department of Geophysical and Geological Science, University College London, Gower Street, London WC1E 6BT, United Kingdom
R. Rabe
Affiliation:
Department of Geophysical and Geological Science, University College London, Gower Street, London WC1E 6BT, United Kingdom
H. J. Milledge
Affiliation:
Department of Geophysical and Geological Science, University College London, Gower Street, London WC1E 6BT, United Kingdom
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Abstract

Cubic diamond was synthesized with two systems, (1) graphite with pure magnesium carbonate (magnesite) and (2) graphite with mixed potassium and magnesium carbonate at pressures and temperatures above 9.5 GPa, 1600 °C and 9 GPa, 1650 °C, respectively. At these conditions (1) the pure magnesite is solid, whereas (2) the mixed carbonate exists as a melt. In this pressure range, graphite seems to be partially transformed into hexagonal diamond. Measured carbon isotope δ13C values for all the materials suggest that the origin of the carbon source to form cubic diamond was the initial graphite powder, and not the carbonates.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 10 , October 1996 , pp. 2622 - 2632
Copyright
Copyright © Materials Research Society 1996

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