Abstract
Differential thermal analysis has been used in conjunction with entrained droplet specimens to measure the nucleation rates of uncontaminated Sn-rich liquids in contact with solid Bi, Zn and Al. The Bi(Sn) system gave a linear nucleation rate plot and an analysis of the data in terms of the classical theory of heterogeneous nucleation at variable composition, yielded a pre-exponential frequency factor, J s 0, that was in good agreement with the predicted value for pure Sn. On the other hand, the nucleation rates plots for Zn(Sn) and Al(Sn) were irregular and could only be analysed to give approximate estimates of J s 0 for these two systems. The origin of the irregularity was discussed in terms of the surface structure of entrained droplets. In the case of Bi(Sn), the nucleation rate data yielded a catalyst surface energy difference of − 50 ± 26 mJm −2 which agreed with a theoretical estimate for pure Sn nucleating in contact with pure Bi.
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