The interdiffusion in melts of tin-lead system of eutectic and near-eutectic composition

Abstract

The method of gamma-raying of samples by a narrow beam of gamma radiation is used to measure the interdiffusion coefficients in melts of a tin-lead system, which contain 17.6, 26.1, 29.3, and 33.9 at.% Pb, at temperatures from 500 to 1000 K. The results are compared with literature data. It is found that the concentration dependence of diffusion coefficient exhibits no special features in the vicinity of eutectic composition.

Contact Melting in Simple Eutectic System

“…It is found out the absence of the significant concentration dependence of the diffusion coefficient. The extrapolation of the results [10] to a temperature of 463 K leads to the value D=(0.92+0.12)·10 -9 m 2 /s, which is coincides within the error with our result.…”

“…The error indicated here is the 95% confidence limit, and considers only the error in measuring the kinetic factor Δλ. The received diffusion coefficient is comparable with the results of [10], where the results of measuring the diffusion coefficient in melts lead-tin are represented at temperatures from 500 to 1000 K for several compositions from 17.6 to 33.9% of lead. It is found out the absence of the significant concentration dependence of the diffusion coefficient.…”

“…In the calculation of Δλ we used the diffusion coefficient obtained in the first stage of calculations. In the process of obtaining results we used the insensitivity of the diffusion coefficient in melts leadtin to the composition of the liquid, which was revealed in work [10].…”

“…In this case we use the result of [10]10, where it was concluded that there was no in lead-tin explicit dependence of the diffusion coefficient on composition. We obtain…”