Size-dependent nanodiamond-graphite phase transition at 8 GPa |
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| Authors: | V. A. Davydov A. V. Rakhmanina V. N. Agafonov V. N. Khabashesku |
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| Affiliation: | (1) Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia;(2) L.E.M.A., UMR CNRS-CEA 6157-LRC CEA M01, Universite Francois Rabelais, Tours, 37200, France;(3) Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Houston, TX 77005-1892, USA |
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| Abstract: | The size-dependent diamond-graphite phase transition was detected in the course of a study of the growth of nanosized diamond particles under conditions of thermal treatment at 8 GPa. It was found that a critical size of diamond nanoparticles, on reaching which they transformed into graphite, was reached at 1623 K and a treatment time of 60 s, and it was equal to ～18 nm. The activation energy of the solid-phase growth of nanosized diamond particles at 8 GPa was determined to be 112±8 kJ/mol. |
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