Abstract
There is a good deal of ambiguity in the thermodynamic data for SnZn alloys reported by various authors. Thermodynamic studies for this system have shown that ΔH > 0, and also a negative deviation of ΔC p from the Neumann-Kopp rule. These facts indicate a transitional character of the SnZn alloys between systems with a miscibility gap and those with a compound-forming tendency. However, the calculated structural parameters of Bhatia-Thornton, S cc(0) and S(0) thermodynamic, do not exhibit any extrema. The isothermal relations of the viscosity and of the surface tension are similar, and decrease for Zn-rich alloys. The surface ‘phase’ is characterized by a pronounced tin enrichment by comparison with the bulk phase. In addition, the thermodynamic properties of the surface ‘phase’ indicate a negative deviation from ideality, while the bulk phase exhibits a positive deviation.
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