Taniguchi, T;
Dobson, D;
Jones, AP;
Rabe, R;
Milledge, HJ;
(1996)
Synthesis of cubic diamond in the graphite-magnesium carbonate and graphite-K2Mg(CO3)(2) systems at high pressure of 9-10 GPa region.
Journal of Materials Research
, 11
(10)
2622 - 2632.
10.1557/JMR.1996.0330.
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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 degrees C and 9 GPa, 1650 degrees 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 delta(13)C 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: | Article |
|---|---|
| Title: | Synthesis of cubic diamond in the graphite-magnesium carbonate and graphite-K2Mg(CO3)(2) systems at high pressure of 9-10 GPa region |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1557/JMR.1996.0330 |
| Publisher version: | http://dx.doi.org/10.1557/JMR.1996.0330 |
| Language: | English |
| Additional information: | Copyright Cambridge University Press 1996 |
| Keywords: | High-temperature, Synchrotron radiation, Phase-transformation, Melt |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/71965 |
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