Investigations of adsorption states of protium and deuterium in redeposited carbon flakes formed in tokamak T-10

• Published in: Journal of nuclear materials 2008-05, Vol.376 (2), p.152-159
• Main Authors: Svechnikov, N.Yu, Stankevich, V.G., Sukhanov, L.P., Menshikov, K.A., Lebedev, A.M., Kolbasov, B.N., Zubavichus, Y.V., Rajarathnam, D.
• Format: Article
• Language: English
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2008.02.072

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 (450–800K and 900–1000K), 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 1.25eV/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.