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Gibbs free energy of formation of magnesium stannate

Jacob, KT and Valderrama, JN (1977) Gibbs free energy of formation of magnesium stannate. In: Journal of Solid State Chemistry, 22 (3). 291-295 .

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Official URL: http://dx.doi.org/10.1016/0022-4596(77)90005-6

Abstract

he thermodynamic properties of the spinel Mg2SnO4 have been determined by emf measurements on the solid oxide galvanic cell,View the MathML source in the temperature range 600 to 1000°C. The Gibbs' free energy of formation of Mg2SnO4 from the component oxides can be expressed as View the MathML source,View the MathML source These values are in good agreement with the information obtained by Jackson et al. [Earth Planet. Sci. Lett.24, 203 (1974)] on the high pressure decomposition of magnesium stannate into component oxides at different temperatures. The thermodynamic data suggest that the spinel phase is entropy stabilized, and would be unstable below 207 (±25)°C at atmospheric pressure. Based on the information obtained in this study and trends in the stability of aluminate and chromite spinels, it can be deduced that the stannates of nickel and copper(II) are unstable.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Dec 2011 07:48
Last Modified: 01 Dec 2011 07:48
URI: http://eprints.iisc.ernet.in/id/eprint/42495

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