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  1. 1 Open Chemistry

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  1. 1 2011

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  1. 1 Milcheva N.

  2. 1 Romanowska J.

  3. 1 Vassilev G.

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Sn-Ni-Bi liquid phase thermodynamic properties

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Milcheva N., Romanowska J., Vassilev G.
Open Chemistry
|
2011
|
vol. 9
|
issue 1
149-156
EN
Experimental data of bismuth activity coefficients at 1773 K were obtained by isopiestic method and compared to calculated values. Thermodynamic properties of the Sn-Ni-Bi liquid phase were estimated by means of the general solution model and by the methods of Kohler. Description of the ternary liquid phase (Gibbs excess energy dependence on the temperature and the composition) was achieved by using available thermodynamic data of the constitutive binary systems (Ni-Bi, Sn-Bi, Sn-Ni). A comparison between calculated quantities and experimental data wasconducted. The present assessment with thermodynamically optimized values of the system Sn-Ni-Bi (obtained by the CALPHAD approach) was in good agreement. The suggested appearance of a liquid phase miscibility gap at high temperatures is in agreement with the experimental bismuth activity data and with the assessed thermochemical functions. [...]
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