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The influence of heat treatment on the structure and electrical properties of Nix(NbO)100–x thin films obtained by the ion-beam sputtering of a composite target is investigated. The composite structure is found to be formed during the deposition of Ni–NbO films and to contain a mixture of nanoscale face-centered cubic (fcc) Ni grains and amorphous niobium oxide. Annealing at 550°C leads to the crystallization...