THE ORIENTATION DEPENDENCE OF THE HYDROGEN DISTRIBUTION WITHIN MO V(110) AND MO/V(001) MULTILAYERED ARTIFICIAL SUPERLATTICES/

We have investigated the hydrogen distribution within multilayered Mo/ V (110) and (001) artificial superlattices. The hydrogen concentration , determined by the H-1(N-15, alpha gamma)C-12 nuclear resonance react ion, is found to decrease with decreasing layer thickness. The decreas e is attributed to an interface region with reduced hydrogen content. The extension of this interface region is found to be two monolayers i n Mo/V (110), compared to the previously reported three monolayers in Mo/V (001) superlattices. In the (110) oriented samples the relative a mount of H in the interface region decreases with increasing average H content (H/V (atomic ratio) approximate to 0.3-0.5). This effect is s hown to be related to the orientation of the hydrogen planes with resp ect to the boundaries implied by the Mo/V interfaces. The hydrogen ind uced volume change, obtained by conventional theta-2 theta x-ray diffr action (XRD) and reciprocal space mapping, is found to be smaller for the (110) samples than for the (001) oriented samples at room temperat ure.