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# Measurement of Gibbs energies of formation of $CoF_2$, and $MnF_2$, using a new composite dispersed solid electrolyte

Jacob, KT and Hajra, JP (1987) Measurement of Gibbs energies of formation of $CoF_2$, and $MnF_2$, using a new composite dispersed solid electrolyte. In: Bulletin of Materials Science, 9 (1). pp. 37-46.

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## Abstract

Gibbs energies of formation of $CoF_2$, and $MnF_2$, have been measured in the temperature range from 700 to 1100 K using $Al_20_3$-dispersed $CaF_2$, solid electrolyte and Ni + $NiF_2$, as the reference electrode. The dispersed solid electrolyte has higher conductivity than pure $CaF_2$, thus permitting accurate measurements at lower temperatures. However, to prevent reaction between $A1_20_3$ in the solid electrolyte and $NiF_2$, (or $CoF_2$) at the electrode, the dispersed solid electrolyte was coated with pure $CaF_2$, thus creating a composite structure. The free energies of formation of $CoF_2$, and $MnF_2$, are (\pm 1700) $J mol^{-l}$.

Item Type: Journal Article http://www.ias.ac.in/j_archive/bms/9/1/3... Copyright of this article belongs to Indian Academy of Sciences. Chemical potential of fluorine;thermodynamic properties;electromotive force;enthalpy;entropy;free energy of formation. Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 30 Jun 2008 19 Sep 2010 04:46 http://eprints.iisc.ernet.in/id/eprint/14480

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