Determination of the thermodynamic properties of 'xMgO + (1 - x)MnO' (s,sln) from a solid-electrolyte galvanic cell in the temperature range 1163 to 1318 K

Raghavan, S. ; Iyengar, G. N. K. ; Abraham, K. P. (1985) Determination of the thermodynamic properties of 'xMgO + (1 - x)MnO' (s,sln) from a solid-electrolyte galvanic cell in the temperature range 1163 to 1318 K Journal of Chemical Thermodynamics, 17 (6). pp. 585-591. ISSN 0021-9614

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Official URL: http://dx.doi.org/10.1016/0021-9614(85)90058-8

Related URL: http://dx.doi.org/10.1016/0021-9614(85)90058-8

Abstract

The thermodynamic activities of MgO in the NaCl-type solid solutions which can exist in "xMgO + (1 - x)MnO' have been determined in the temperature range 1163 to 1318 K from a solid-state galvanic cell incorporating MgF2 as the solid electrolyte. The activities of MnO have been calculated by a graphical Gibbs-Duhem integration method. The activities of both the components exhibit positive deviations from ideality over the entire composition range. The excess molar enthalpies are found to be positive. Further, "xMgO + (1 - x)MnO' does not conform to regular-solution behaviour. The origin of the excess thermodynamic properties is discussed in relation to the cationic size disparity and the crystal-field effects.

Item Type:Article
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