Abstract
The oxidation in air of AuIn alloys with low indium content (1 ppm, 0.1 and 1.0 at. %) was investigated with the help of the time-differential perturbed angular correlation technique. From the results it is concluded that the oxidation is external and is independent of solute concentration. While in the concentrated alloys, the oxide formed was In2O3, in the cases of the dilute ones, In-O-Au complexes appeared. From the oxidation rate in the temperature range 300–1000 °C values of the frequency factor A=0.006(10) cm2/s and the activation energy Q=29.0(5) kcal/mol for the diffusion of indium in gold were obtained.
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