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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:15 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Solid State Physics and Materials Science
Title:
Complex investigation of annealed Si(0 0 1)/Fe/Be/W multilayers
Authors:
S.G. Sandu (1,3), P. Palade (1), G. Schinteie (1), L. Trupina (1), G.A. Lungu (1), N.G. Gheorghe (1), C.M. Teodorescu (1), C. Porosnicu (2), I. Jepu (2), C.P. Lungu (2), G. Filoti (1) and V. Kuncser (1)
Affiliation:
1.National Institute for Materials Physics, P.O.Box MG-7, 77125, Bucharest-Magurele, Romania
2.National Institute for Laser, Plasma and Radiation Physics, 77125, Bucharest-Magurele, Romania
3.Bucharest University, Faculty of Physics, 077125, Bucharest-Magurele, Romania
E-mail
simona.sandu@infim.ro
Keywords:
plasma facing components, Be/W bilayers, atomic interdiffusion, XPS, CEMS, GIXRD, XRR, AFM
Abstract:
Intense studies are presently conducted on materials to be used as plasma facing components, in a tokamak-like fusion reactor. A particular attention is given in this respect to Be and W based composites and multilayers. Be/W bilayers have been deposited by thermionic vacuum arc method (TVA) on Si(0 0 1) substrates with hydrogenated Fe buffer layers enriched in the 57Fe Mössbauer isotope and subsequently annealed in vacuum at 600°C, for 10 minutes. The influence of thermal annealing on the phase composition and atomic intermixing processes has been analyzed by means of grazing incidence X-ray diffractometry (GIXRD), X-Ray reflectometry (XRR), Atomic Force Microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and conversion electron Mössbauer spectroscopy (CEMS). Oxide phases are prevailing in the uppermost layers, while the lower layers mostly contain neutral phases, as observed from the XPS data. The CEMS results evidence the presence in the as-deposited structures of a main metallic Fe phase and secondary superparamagnetic Fe oxide phases at the Fe/Be interface, while annealed samples present a large superparamagnetic contribution of Fe-Be mixtures. The main effects of thermal annealing are a considerable atomic interdiffusion and an increase of Be/W interface roughness, with direct influence on the structural properties and sputtering yields.
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