Abstract
A new metastable state in the Ni–Nb system was observed by ion mixing of Ni–Nb multilayered films with an overall composition Ni 64Nb 36. In comparison with a readily formed Ni 70Nb 30 metastable HCP phase, the new state, which was obtained only by ion mixing but not by solid-state reaction, corresponded to another HCP structure with different lattice constants as well as a small deviation from the exact stoichiometry of Ni/Nb=70/30. The formation of the new metastable crystalline phase was discussed in terms of the restricted kinetic condition in the far-from-equilibrium process of ion mixing as well as of the valence electron effect.
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