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Solubility and activity of oxygen in liquid bismuth

Jacob, KT and Mansoor, AK (2016) Solubility and activity of oxygen in liquid bismuth. In: CANADIAN METALLURGICAL QUARTERLY, 55 (2). pp. 202-209.

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Official URL: http://dx.doi.org/10.1080/00084433.2015.1134865

Abstract

The solubility of oxygen in liquid Bi has been measured by two independent methods - coulometric titration using a solid electrolyte and isopiestic - in the temperature range from 800 to 1300 K. The solubility of oxygen in equilibrium with alpha-Bi2O3 (800-1002 K) can be expressed by, In (at.-% O) = -11468/(T/K) + 10.095 The solubility of oxygen in equilibrium with delta-Bi2O3 (1002-1078 K) can be expressed by, In (at.-% O) = -10174/(T/K) + 8.781 Variation of the activity of oxygen with concentration in Bi-O solution has also been measured using an electrochemical technique in the temperature range from 800 to 1400 K. Gibbs energy change for the oxygen dissolution reaction is given by, 1/2 O-2 -> O](Bi(at.-%) (ss)) Delta G degrees(+/- 200)/Jmol(-1) = -99997 + 13.26 (T/K) where the standard state for dissolved oxygen identified by square brackets is an infinitely dilute solution in which activity is equal to concentration in at.-%. Small deviations from Sievert's law were observed at all temperatures. The deviations can be quantified by the first-order interaction parameter: epsilon(o)(o) = partial derivative In f(o)/partial derivative X-o = -23260/(T/K) + 9.61

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Keywords: Bi-O solution; Thermodynamic properties; Oxygen dissolution; Gibbs energy; Oxygen self-interaction parameter; Advanced solid state cell
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 22 Jun 2016 06:22
Last Modified: 22 Jun 2016 06:22
URI: http://eprints.iisc.ac.in/id/eprint/54062

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