Abstract
Amorphous carbons prepared from furfuryl alcohol resin have been studied in a high-pressure apparatus of octahedral anvil type at pressures up to 18 GPa and at temperatures up to 2000° C. The amorphous carbons, when heated under pressure, crystallized first into graphite at 450 to 600°C and then into diamond at 1120 to 2000° C. The temperatures for the onset of these crystallizations,T 9 andT d, were determined by a simple technique. As the temperature for the preparation of the amorphous carbons was raised from 700 to 1000° C,T 9 at 15 GPa increased slightly whereasT d at the same pressure turned from a decrease into an increase beyond 750° C for the preparation temperature. For amorphous carbon prepared at 850° C,T g increased a little whileT d decreased markedly with increasing pressure.
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Onodera, A., Higashi, K. & Irie, Y. Crystallization of amorphous carbon at high static pressure and high temperature. J Mater Sci 23, 422–428 (1988). https://doi.org/10.1007/BF01174666
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DOI: https://doi.org/10.1007/BF01174666