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The Cu-Nb alloy films with positive heat of mixing were prepared by ion-beam-assisted deposition (IBAD) technique. A new Nb-rich fcc phase and an amorphous phase, with composition range around 65-75% Nb fraction, were obtained in Cu-Nb films deposited under Ar + ion bombardments with energy below 7 keV. The supersaturated bcc phase was also formed in Cu 20 Nb 80 films...
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