SHOCK-INDUCED MARTENSITIC-TRANSFORMATION OF HIGHLY ORIENTED GRAPHITE TO DIAMOND

Shock-wave profiles of highly ordered pyrolytic graphite shocked normal to the basal plane of the graphite crystal structure have been measured. For graphite with sufficient orientational order a martensitic transformation to a diamond-like phase is observed with a transition onset pressure 19.6 +/-...

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Veröffentlicht in:	Journal of applied physics 1992-05, Vol.71 (10), p.4882-4886
Hauptverfasser:	ERSKINE, DJ, NELLIS, WJ
Format:	Artikel
Sprache:	eng
Schlagworte:	360602 - Other Materials- Structure & Phase Studies 665000 - Physics of Condensed Matter- (1992-) CARBON CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed matter: structure, mechanical and thermal properties CRYSTAL-PHASE TRANSFORMATIONS DIAMONDS ELEMENTAL MINERALS ELEMENTS Equations of state, phase equilibria, and phase transitions Exact sciences and technology GRAPHITE MATERIALS SCIENCE MINERALS NONMETALS PHASE TRANSFORMATIONS Physical Sciences Physics Physics, Applied PRESSURE EFFECTS Science & Technology SHOCK WAVES Specific phase transitions SYNTHESIS VERY HIGH PRESSURE
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Zusammenfassung:	Shock-wave profiles of highly ordered pyrolytic graphite shocked normal to the basal plane of the graphite crystal structure have been measured. For graphite with sufficient orientational order a martensitic transformation to a diamond-like phase is observed with a transition onset pressure 19.6 +/- 0.7 GPa, the stability limit of the graphite structure under shock compression. The minimum overpressure required for the transformation is not more than 6 GPa and the two-wave structure of the transition is overdriven to a single wave above 40 GPa.
ISSN:	0021-8979 1089-7550
DOI:	10.1063/1.350633