Electrochemical Determination of the Gibbs Energy of Formation of MgAl2O4 |
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| Authors: | K Thomas Jacob Kampurath P Jayadevan Yoshio Waseda |
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| Affiliation: | Materials Research Centre and Department of Metallurgy, Indian Institute of Science, Bangalore 560012, India;Institute of Advanced Materials Processing, Tohoku University, Sendai 980, Japan |
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| 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—capdelta G °f,ox=?23600 ? 5.91 T (±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. |
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