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Title: Investigations of adsorption states of protium and deuterium in redeposited carbon flakes formed in tokamak T-10
Authors: Svechnikov, N.Yu.
Stankevich, V.G.
Sukhanov, L.P.
Menshikov, K.A.
Lebedev, A.M.
Kolbasov, B.N.
Zubavichus, Y.V.
Rajarathnam, D. 
Issue Date: 31-May-2008
Citation: Svechnikov, N.Yu., Stankevich, V.G., Sukhanov, L.P., Menshikov, K.A., Lebedev, A.M., Kolbasov, B.N., Zubavichus, Y.V., Rajarathnam, D. (2008-05-31). Investigations of adsorption states of protium and deuterium in redeposited carbon flakes formed in tokamak T-10. Journal of Nuclear Materials 376 (2) : 152-159. ScholarBank@NUS Repository.
Abstract: This work reports thermal desorption spectroscopy (TDS), Fourier-transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) analyses on free standing redeposited hydrocarbon films (flakes) with a high deuterium to hydrogen isotopic ratio, produced in the T-10 tokamak in the Kurchatov Institute. XRD pattern showed that the carbon flakes differ substantially from graphite and are non-crystalline. The TDS D2(H2) curves consist of two groups of peaks (450-800 K and 900-1000 K), and appeared to be rather similar to those obtained for a mechanically milled nanostructured graphite. As a result, two main adsorption states with activation energies of about 0.65 and 1.25 eV/H were found, implying a hopping diffusion and a resonance mechanism, respectively. The IR spectral differences between reddish-gold and dark-brown flakes showed a less degree of C-H hybridization for dark films and a disordered carbon network, to which the CD2,3 end-groups are connected. © 2008 Elsevier B.V. All rights reserved.
Source Title: Journal of Nuclear Materials
ISSN: 00223115
DOI: 10.1016/j.jnucmat.2008.02.072
Appears in Collections:Staff Publications

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