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Free Energy of Mixing of Two Magnesium Based Binary Liquid Alloys

Author Affiliations

  • 1Dept. of Physics, M.M.A.M. Campus, Tribhuvan University, Biratnagar, NEPAL
  • 2Dept. of Chemistry, M.M.A.M. Campus, Tribhuvan University, Biratnagar, NEPAL
  • 3Dept. of Mathematics, M.M.A.M. Campus, Tribhuvan University, Biratnagar, NEPAL

Res.J.chem.sci., Volume 1, Issue (2), Pages 99-102, May,18 (2011)

Abstract

There are a large number of binary liquid alloys which exhibit interesting behavior as a function of concentration as regards the thermodynamic properties. The anomalous behavior of these liquid alloys is least understood and demands extensive theoretical investigations. In the present work we have considered two binary molten alloys of magnesium-magnesium-bismuth and magnesium-tin-and tried to calculate their free energy of mixing (GM) at different concentrations of the ingredients. Flory’s model has been applied to study the asymmetric behavior of GM of them. It is a statistical mechanical model for the binary liquid alloys based on the size factor of the constituent metals. For each alloy we have started with the expression for activity of magnesium within it according to this model.Activity (a) is one of the fortunate thermodynamic functions which are obtained directly from experiment.After knowing the ratio of the atomic volumes of the constituent species of the alloy we have determined the interchange energy ) between them from the experimental values of ‘a’ by the method of successive approximations. Thereafter GM has been computed from the mathematical expression of it by using this value of w. The results explain the observed anomaly in the free energy of mixing of the present liquid alloys.

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