THE USE OF THE EMF METHOD IN THE THERMODYAMIC OF METALLURGICAL PROCESSES

Vassiliev, V.

Автор: Valery Vassiliev
Сборник: The 49th International October Conference on Mining and Metallurgy
Серия: 1
Том: 1
Тезисы
Год издания: 2017
Издательство: University of Belgrade
Местоположение издательства: Сербия
Первая страница: 492
Последняя страница: 496
Аннотация: Knowledge of thermodynamic properties and phase diagrams of binary, ternary and many component systems is necessary for solving materials science problems and to design new products and technologies fitted to actual needs. A rational study of phase equilibria and thermodynamic properties of a given system leads not only to discover unknown phases long before they can create practical problems but to determine phase thermodynamic stability, homogeneity domain boundaries, and finally to elaborate an analytical description of the system by using thermodynamic models which are based on phase Gibbs energies written as functions of temperature, concentration and pressure. Experimental studies are the information primary source for any system thermodynamic properties and phase diagrams. The method of electromotive force (EMF) is one of the most important methods of the physico-chemical analysis. One peculiarity of the EMF is its proportionality to one component of the system chemical potential = n•F•E (n-charge of the ion responsible of the potential, F=96485.34 C/mol Faraday’s constant, E electromotive force). Improving measurement accuracy and reproducibility leads to increase the quality and quantity of information about the system. Values of chemical potential (T, xi) acquired with uncertainties of 500 J/mol (especially in a narrow temperature range) give only rough estimates of partial entropy and enthalpy of the components. An accuracy improvement in determining of chemical potential up to 10-50 J/mol not only leads to the various thermodynamic properties of the system (partial entropies and enthalpies of components, phase enthalpies of transformation,partial enthalpies at infinite dilution, thermal capacities (Сp), but it also gives a possibility to study the phase diagram in detail (liquidus and solidus, miscibility gaps, invariant points, stoichiometry deviations, ordering, etc...)
Добавил в систему: Васильев Валерий Петрович

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