Activity and Diffusivity of Oxygen in the Liquid Dilute BixSb1-x Solutions

J. Min. Metall. Sect. B-Metall. 54 (2) B (2018) 261-270. DOI:10.2298/JMMB180311014J
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Abstract

The diffusivity and activity coefficient of oxygen in liquid antimony, bismuth, and antimony-bismuth alloys were determined from coulometric titration experiments, which were performed in the temperature range from 985 to 1185 K. The diffusivity in pure metals (in cm2/s) is: D_O(Bi)^0=(1.3∙〖10〗^(-2) ) exp⁡((-53143)/RT) and D_O(Sb)^0=(2.24∙〖10〗^(-4) ) exp⁡((-14591)/RT). The standard free energy of solution of oxygen in liquid antimony, bismuth and antimony-bismuth alloys according to the reaction ½ O2 (g) = O (infinite dilution) is calculated. The activity coefficient of oxygen γ_(O(Bi,Sb or Bi-Sb))^0 was calculated at 1085 K as a function of the alloy composition. It was demonstrated that Wagner's model with one adjustable parameter h gave a satisfactory description of the experimental data.
Keywords: Coulometric titration method; Activity coefficient of oxygen; Diffusivity of oxygen; Bi-Sb alloys
Correspondence Address:
D. Jendrzejczyk-Handzlik,
AGH University of Science and Technology,
Faculty of Non-ferrous Metals, Krakow, Poland
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