The entry and transport of hydrogen in polycrystalline nickel implanted with various elements (He, Ar, B, P, S, Bi, Ni, Y, Pt, As, Pb and Sb) has been investigated in a fluence range of 1 x 10 14 to 2 x 10 17 ions/cm 2 using an electrochemical permeation technique and etching technique, where the elements used are categorized as follows: inert elements (He and Ar), the substrate element (Ni), metalloids (P, S, Sb and As), a catalytic element (Pt) and the other elements (Pb, Bi, Y and B). It was

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... found that the effective diffusion coefficient of hydrogen and the effective solubility were largely dependent upon fluence and elements in comparison to those obtained from non-implanted nickel. The results obtained were qualitatively explained in terms of gas bubbles and defects generated by implantation, compressive stress, catalytic effect, the formation of amorphous phase and so on.