Internal oxidation of impurities in gold

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Abstract
The conditions of internal oxidation of impurities in polycrystalline gold wire of nominal purity 6 N have been studied. The annealing in pure oxygen at normal pressure proved to be more efficient than standardly used annealing in air, while annealing at reduced oxygen pressure has not been successful. This behaviour can be understood as being due to the extremely low solubility of oxygen in gold. The oxidising treatment made it possible to suppress the concentratPPMion of free iron impurities from 2.6+or-0.4 atPPM in the as-received state to well below 0.2 atPPM as determined from the resistivity minimum effect. The impurity oxides are presumably responsible for large deviations of longitudinal magnetoresistance from Kohler's rule, indicating their strong contribution to small-angle electron scattering at low temperatures.

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