Thermodynamic assessment of chemical and electrochemical stability of vanadium silicides
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Thermodynamic assessment of chemical and electrochemical stability of vanadium silicides

P.A. Nikolaychuk

University of Greifswald, Greifswald, 17487 Germany

E-mail: npa@csu.ru

Received March 5, 2019

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DOI: 10.26907/2542-064X.2020.1.52-68

For citation: Nikolaychuk P.A. Thermodynamic assessment of chemical and electrochemical stability of vanadium silicides. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2020, vol. 162, no. 1, pp. 52–68. doi: 10.26907/2542-064X.2020.1.52-68. (In Russian)

Abstract

The phase and chemical equilibria in the V–Si system at 25 °C were considered. The possible maximum solid solubility of Si in bcc-V at 25 °C was estimated. The thermodynamic activities of the components in this saturated solution were calculated. The state diagram of the V–Si–O system at 25 °C was plotted and the characteristics of their invariant conditions were calculated. The activity – pH diagram for vanadium(V) compounds was plotted. The potential – pH diagram of the V–Si–H2O system at 25 °C, air pressure of 1 bar, and activities of ions in solution equal to 1 mol/L was plotted. The thermodynamic analysis of chemical and electrochemical stability of the V–Si system alloys was performed.

Keywords: V–Si system, vanadium silicides, phase equilibria, low temperature oxidation, chemical and electrochemical stability

Figure Captions

Fig. 1. The state diagram of the V–Si–O system.

Fig. 2. The activity – pH diagram for V(V) compounds at 25 °C and the air pressure of 1 bar.

Fig. 3. The potential – pH diagram of the V–Si–H2O system at 25 °C, air pressure of 1 bar, and activities of ions in solution equal to 1 mol/L.

Fig. 4. The potential – pH diagram of the V–Si–H2O system cut in the area of thermodynamic stability of vanadium silicides. Areas from the diagram are given in the text.

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