A new hard allotropic form of carbon: Dream or reality?статья

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[1] A new hard allotropic form of carbon: Dream or reality? / I. Konyashin, V. Khvostov, V. Babaev et al. // International Journal of Refractory Metals and Hard Materials. — 2006. — Vol. 24, no. 1–2. — P. 17–23. An unusual phase of carbon with the fcc crystal structure, the lattice constant of which is very close to that of diamond, was reported before in a number of publications. In all the published works, the existence of fcc carbon could not be unambiguously established, as only insignificant amounts of fcc carbon in mixture with other carbon modifications were obtained so far. The present work provides for the first time clear evidence for the existence of the carbon modification with the fcc crystal structure. Thin films consisting exceptionally of fcc carbon were obtained by various methods, namely by hot-filament CVD, plasma-assisted CVD and treatment of the diamond surface in hydrogen plasmas. Results of electron diffraction, Raman spectroscopy, AES, XPS, EELS and HRTEM of the films consisting of fcc carbon clearly indicate its unique crystal and electron structure. The micro-hardness of the films of fcc carbon was found to be equal to HV0.01& xa0;=& xa0;250 which is quite different from the hardness of all the known carbon modifications. [ DOI ]

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