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

Raghavana, S and Iyengar, GNK and Abraham, KP (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. In: The Journal of Chemical Thermodynamics, 17 (6). pp. 585-591.

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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 $MgF_2$ 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:	Journal Article
Publication:	The Journal of Chemical Thermodynamics
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	11 Jul 2008
Last Modified:	23 Feb 2012 05:04
URI:	http://eprints.iisc.ac.in/id/eprint/14870

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