Abstract

The aging effect of the electlical resistance of nickel, copper, and Ni-Cu films and resistance-strain characteristics (strain coefficient or gauge-factor K) are measured in a vacuum bell jar. These effects depend on the thickness of films. The gauge-factor K of relatively thick films tends to approach the value of the bulk one, and the resistance of films decreases with time just after the evaporation. The K-factot of a relatively thin film is larger than that of the bulk, and its resistance increases with time after the evaporation. The gauge-factor K of the films of intermediate thickness has a minimum value and the resistance varies gradually with time.The imperfections of the films produced by evaporation or adsorption of gases are seemed to affect on the electrical and mechanical properties of the films.

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