Diamond formation by thermal activation of graphite

A. V. Palnichenko, A. M. Jonas, J.-C. Charlier (), A. S. Aronin and J.-P. Issi
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A. V. Palnichenko: Unité de Physico-Chimie et de Physique des Matériaux, Université Catholique de Louvain
A. M. Jonas: Unité de Chimie et de Physique des Hauts Polymères, Université Catholique de Louvain
J.-C. Charlier: Unité de Physico-Chimie et de Physique des Matériaux, Université Catholique de Louvain
A. S. Aronin: Institute of Solid State Physics, Russian Academy of Sciences, Moscow district
J.-P. Issi: Unité de Physico-Chimie et de Physique des Matériaux, Université Catholique de Louvain

Nature, 1999, vol. 402, issue 6758, 162-165

Abstract: Abstract Synthetic diamond is used in applications ranging from abrasives, tool coatings, bearing surfaces, microelectronics and optics to corrosion protection1,2. The first artificial synthesis used high-pressure techniques to produce diamond as the thermodynamically stable form3, but it can also be grown at low pressures as a metastable carbon phase1,2. Here we report the production of high-purity cubic diamond microparticles (10–100 µm), which form in a highly concentrated carbon-vapour phase, followed by deposition of the crystals on the substrate. The carbon-vapour phase is generated by thermal activation of graphite, and the fast initial growth-rates of diamond, in the range 100–500 µm s-1, are at least two orders of magnitude higher than previously reported1,2. We expect that tuning of experimental parameters to optimize the density of the carbon-vapour phase will allow us to grow larger diamond crystals, thereby opening a wider range of potential practical applications.

Date: 1999
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DOI: 10.1038/46000

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