Solubility and activity of oxygen in liquid gallium and gallium-copper alloys

Alcock, C. B. ; Jacob, K. T. (1977) Solubility and activity of oxygen in liquid gallium and gallium-copper alloys Journal of the Less-Common Metals, 53 (2). pp. 211-222. ISSN 0022-5088

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0022-5088(77)90106-0

Abstract

The solubility of oxygen in liquid gallium in the temperature range 775 –1125 °C and in liquid gallium-copper alloys at 1100 °C, in equilibrium with β-Ga2O3, has been measured by an isopiestic equilibrium technique. The solubility of oxygen in pure gallium is given by the equation log (at.% O) = −7380/T + 4.264 (±0.03) Using recently measured values for the standard free energy of formation of β-Ga2O3 and assuming that oxygen obeys Sievert's law up to the saturation limit, the standard free energy of solution of oxygen in liquid gallium may be calculated :1⁄ 2O2(g)→OGaΔ°298 = −52 680 + 6.53T (±200) cal where the standard state for dissolved oxygen is an infinitely dilute solution in which the activity is equal to atomic per cent. The effect of copper on the activity of oxygen dissolved in liquid gallium is found to be in good agreement with that predicted by a recent quasichemical model in which it was assumed that each oxygen is interstitially coordinated to four metal atoms and that the nearest neighbour metal atoms lose approximately half their metallic cohesive energies.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:94761
Deposited On:17 Oct 2012 10:45
Last Modified:17 Oct 2012 10:45

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