# Electrochemical Determination of the Gibbs Energy of Formation of $MgAl_2O_4$

Jacob, Thomas K and Jayadevan, Kampurath P and Waseda, Yoshio (1998) Electrochemical Determination of the Gibbs Energy of Formation of $MgAl_2O_4$. In: Journal of the American Ceramic Society, 81 (1). pp. 209-221.

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## Abstract

The standard Gibbs energy of formation of the spinel $MgAl_2O_4$ from component oxides, MgO and alpha-$Al_2O_3$, has been determined in the temperature range 900 to 1250 K using a solid-state cell incorporating single-crystal $CaF_2$ as the solid electrolyte. The cell can be represented as--$Pt,O_2,MgO+MgF_2|CaF_2|MgF_2+MgAl_2O_4+alpha-Al_2O_3,O_2,Pt$--The standard Gibbs energy of formation from binary oxides, computed from the reversible emf, can be represented by the expression--capdelta $G^o_{f,ox}$ = -23600 - 5.91 $\tau$ (±150) J/mol--The second-law'' enthalpy of formation of $MgAl_2O_4$ obtained in this study is in good agreement with high-temperature solution calorimetric studies reported in the literature.

Item Type: Journal Article Presently DOI is not working.Copyright of this article belongs to Blackwell. Division of Chemical Sciences > Materials Research Centre 20 Nov 2006 27 Aug 2008 12:15 http://eprints.iisc.ernet.in/id/eprint/7954