Size mismatch effects on the atomic transport properties of copper and potassium-based liquid alloys

✍ Scribed by O.E. Awe

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 449 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2010.03.028

✦ Synopsis

We have used the quasi-chemical approximation, Darken's thermodynamic equation of diffusion and the model of Singh and Sommer to study the size mismatch effects on the transport properties of Cu-Pb, Cu-Tl, K-Pb and K-Tl liquid alloys.

The results obtained shows that using the same fitted value of order energy, W=k B T: size mismatch has more effects on the transport properties of K-Tl, a heterocoordinated alloy with size ratio of 2.62 than on K-Pb, a heterocoordinated alloy with size ratio of 2.43 and surprisingly, the effects of size mismatch on the transport properties of Cu-Tl, a homocoordinated alloy with size ratio of 2.27 is more than on Cu-Pb, a homocoordinated alloy with size ratio of 2.45; size mismatch causes a cross-over from decrease to increase in the degree of chemical ordering in K-Pb and K-Tl while in Cu-Pb and Cu-Tl it leads to a cross-over from decrease to increase in the degree of phase separation depending on the composition of K and Cu in their respective alloys.