Precipitation of diamond and graphite from super-cooled molten metal in a Ni-C system under HPHT conditions

Citation
T. Kawashima et al., Precipitation of diamond and graphite from super-cooled molten metal in a Ni-C system under HPHT conditions, NEW DIAM FR, 10(5), 2000, pp. 283-289
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
NEW DIAMOND AND FRONTIER CARBON TECHNOLOGY
ISSN journal
1344-9931 → ACNP
Volume
10
Issue
5
Year of publication
2000
Pages
283 - 289
Database
ISI
SICI code
1344-9931(2000)10:5<283:PODAGF>2.0.ZU;2-C
Abstract
Molten nickel saturated with carbon was cooled at slow rates from 1500 degr eesC at 6GPa in the presence of diamond crystals. Graphite preferentially n ucleated and grew in the nickel in spite of being less stable than diamond. Diamond dendrites grew from the diamond already present while the graphite was growing. The result suggests that under the conditions studied here, g raphite has a lower barrier for nucleation than diamond, even if graphite i s thermodynamically less stable than diamond.