Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-11-10
Physics
Condensed Matter
Statistical Mechanics
9 pages, 4 figures
Scientific paper
In this study methods of statistical thermodynamics were applied to white tin - grey tin equilibrium to find if there is any correlation between Debye temperature of an additive and its effect on the equilibrium. Gibbs free energy of the transition was calculated for a composite system comprised of tin and the additive in assumption of Debye temperature of the composite system being a linear combination of Debye temperatures of the components with their respective molar fractions as weighing coefficients. Calculations showed that additives which Debye temperatures are above 214oK should stabilize grey tin, while the additives with Debye temperatures below 214oK should stabilize the white one. Devised rule corroborates with all previously reported experimental data on the effect of different additives on the transition. Predictions of the rule about non reported additives provide a mean for its experimental verification.
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