ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Graphitization of amorphous carbon has been studied at high static pressures up to 15 GPa and high temperatures up to 1300 °C, primarily under diamond-stable conditions. Upon heating at 2 GPa, amorphous carbon turns into graphite at ∼900 °C. The temperature for the graphitization decreases with increasing pressure and approaches 600 °C at 10 GPa or higher. The graphitization process at 15 GPa comprises two stages over a temperature range 600–1300 °C. In the first stage, below 900 °C, graphite layers develop and the interlayer spacing decreases markedly. The second stage, above 1000 °C, corresponds to in-layer arrangement and partial development of three-dimensional ordering. At temperatures approaching diamond formation under this pressure, the graphitization does not acquire completion. Along 1300 °C isotherm, the structure and texture of graphite exhibit appreciable changes across the graphite-diamond equilibrium line and also across 11 GPa.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.348652
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