Inter-Diffusion in Molten Lead-Antimony and Lead-Antimony-Bismuth Alloys

Abstract

The inter-diffusion coefficients \ ildeD in molten lead-antimony and lead-antimony-bismuth alloys have been measured by means of the diffusion couple method in the temperature range 400° to 700°C. Antimony distribution in the specimen was determined with an electron probe microanalyser. The results can be represented by the following equation:
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Dependence of \ ildeD on concentrations of antimony was not found up to 0.0822 atomic fraction of antimony in the lead-antimony binary system. Influence of bismuth on \ ildeD in the lead-antimony-bismuth system was also negligible up to 0.1489 atomic fraction of bismuth within the limit of experimental error. The experimental results proved the validity of theoretical prediction that the inter-diffusion coefficients \ ildeD takes the values colse to the self-diffusion coefficient of lead D_Pb^* under given conditions.