Abstract
Pulsed laser action upon a sample of highly oriented pyrolytic graphite (HOPG) in a gasostat filled with helium at a pressure above that corresponding to the triple point of carbon, followed by rapid quenching of the liquid phase at a rate of about 106 K/s leads to the formation of a crater with a periodic spatial structure at the surface. The composition and structure of nongraphite carbon phases in the near-surface region of the crater have been studied using the Raman scattering spectroscopy, electron microdiffraction, and energy-dispersive X-ray analysis. It is established that rapidly quenched carbon possesses predominantly a hybrid structure of glassy carbon formed as a result of the high-temperature treatment, with inclusions of crystalline carbyne, chaoite, and a hybrid cubic phase of ultradense carbon (C8). The hybrid phases of glassy carbon and C8 had not been reported until now as possible products of solidification of liquid carbon.
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Original Russian Text © A.Yu. Basharin, V.S. Dozhdikov, V.T. Dubinchuk, A.V. Kirillin, I.Yu. Lysenko, M.A. Turchaninov, 2009, published in Pis’ma v Zhurnal Tekhnicheskoĭ Fiziki, 2009, Vol. 35, No. 9, pp. 84–92.
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Basharin, A.Y., Dozhdikov, V.S., Dubinchuk, V.T. et al. Phases formed during rapid quenching of liquid carbon. Tech. Phys. Lett. 35, 428–431 (2009). https://doi.org/10.1134/S1063785009050137
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DOI: https://doi.org/10.1134/S1063785009050137