Abstract
For measurements on the electrical properties of a dilute alloy of a noble metal and a transition element the purity of the metals is of great importance. The preparation of the samples can give rise to difficulties caused by unwanted contamination. It was found that rolled strips of pure Au and Ag gave lower values for the residual resistance than drawn wires. The residual resistance can be regarded as a good measure of the purity, perhaps even better than the temperature coefficient between O°C and 100°C. Therefore we conclude that the preparation of strips may introduce less contamination than that of wires, a conclusion which is confirmed by the disappearance of the minimum of the resistance in some cases. This is important for measurements on dilute alloys, because unwanted, and therefore uncontrolled impurities can obscure the investigated effects.
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