Thermodynamic properties of Eu-Sn melts |
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Authors: | V S Sudavtsova M I Ivanov V V Berezutskii V G Kudin and M A Shevchenko |
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Institution: | (1) Institute for Problems of Materials Science, NAS of Ukraine, Krzhyzhanovsky str. 3, Kiev, 03142, Ukraine;(2) Department of Chemistry, National Taras Shevchenko University, 64 Vladimirska str., Kiev, 01033, Ukraine; |
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Abstract: | Partial and integral mixing enthalpies of melts of the Eu-Sn system were determined by calorimetry at 1300 (1250) K in the
concentration intervals 0 < x
Sn < 0.16 and 0.7 < x
Sn < 1. It was found that the first partial mixing enthalpies of Sn and Eu were −215.6 ± 10.6 and −161.2 ± 7.6 kJ/mol, respectively.
The thermodynamic properties of the Eu-Sn alloys were modeled using the theory of ideal associated solutions over a wide interval
of concentrations and temperatures. In was found that the activities of components exhibit strong negative deviations from
Raoult’s law. At minimum, the calculated integral Gibbs energies of mixing reach −43.4 kJ/mol at x
Sn = 0.48; ΔG
ex = −36 kJ/mol, ΔS
ex = −22 J/(mol K). |
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Keywords: | |
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