Hamburg 2001 – scientific programme
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M: Metallphysik
M 26: Wasserstoff in Metallen II
M 26.1: Fachvortrag
Wednesday, March 28, 2001, 17:15–17:30, S12
Deuterium profile in Mo1−xVx/V superlattices — •Vincent Leiner1, Björgvin Hjörvarsson2, Jens Birch3, and Hartmut Zabel4 — 1Institute Laue-Langevin, Grenoble — 2Royal Institute of Technology, Materialphysics, S-10044 Stockholm, Sweden — 3Linkoping Univ, IFM, Dept Phys, Thin Film Phys Div, SE-58183 Linkoping, Sweden — 4Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum
It is well known that Mo/V superlattices take up interstitial hydrogen residing in the V spacer layers. Since the Mo - layers exhibit no exothermic solubility, the hydrogen atoms retract from entering the Mo layers. Earlier RBS experiments indicate a depletion zone of hydrogen close to the Mo/V interface extending over several monolayers. However, with increasing alloy concentration x in Mo1−xVx/V superlattices the depletion zone should shrink. We report about a recent neutron scattering experiment probing the deuterium profile in a Mo1−xVx/VDy superlattice (x=0.50). The superlattice was grown by dc-magnetron sputtering and exhibits a very high structural quality with satellite reflections extending up to the tenth order. The D concentration y can be tuned such that the neutron optical contrast between the Mo1−xVx and VDy layers vanishes. For this concentration the neutron scattering becomes highly sensitive to the deuterium concentration profile close to the MoV/V interface. From the intensity of the higher order satellite reflections the concentration profile can be extracted.