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Electrochemical determination of the Gibbs energy of formation of MgAl2O4

Jacob, Thomas K and Jayadevan, Kampurath P and Waseda, Yoshio (1998) Electrochemical determination of the Gibbs energy of formation of MgAl2O4. In: Journal of the American Ceramic Society, 81 (1). pp. 209-212.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1151-...

Abstract

The standard Gibbs energy of formation of the spinel MgAl2O4 from component oxides, MgO and α-Al2O3, has been determined in the temperature range 900 to 1250 K using a solid-state cell incorporating single-crystal CaF2 as the solid electrolyte. The cell can be represented as—Pt,O2,MgO+MgF2|CaF2|MgF2+MgAl2O4+α-Al2O3,O2,Pt—The standard Gibbs energy of formation from binary oxides, computed from the reversible emf, can be represented by the expression—capdeltaG°f,ox=−23600 − 5.91T(±150) J/mol—The ‘second-law’ enthalpy of formation of MgAl2O4 obtained in this study is in good agreement with high-temperature solution calorimetric studies reported in the literature.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Mar 2012 06:23
Last Modified: 01 Mar 2012 06:23
URI: http://eprints.iisc.ernet.in/id/eprint/42692

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