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Thermodynamics of $GdMnO_3$ and $GdMn_2O_5$ Phases Determined by the E.M.F Method

Foryst, Pawlas E and Jacob, Thomas K and Fitzner, K (2006) Thermodynamics of $GdMnO_3$ and $GdMn_2O_5$ Phases Determined by the E.M.F Method. In: Archives of Metallurgy and Materials, 51 (3). pp. 481-488.

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Abstract

Using solid oxide galvanic cells of the type:$MnO + Gd_2O_3 + GdMnO_3/O^{−2}/Ni + NiO$ and $Mn_3O_4 + GdMnO_3 + GdMn_2O_5/O^{−2}/$ air the equilibrium oxygen pressure for the following reactions :$MnO + 1/2Gd_2O_3 + 1/4O_2 = GdMnO_3$ $1/_3Mn_3O_4 + GdMnO_3 + 1/3O_2 = GdMn_2O_5$ was determined in the temperature range from 1073 to 1450 K. From the determined equilibrium oxygen partial pressure the corresponding G i b b s free energy change for these reactions was derived:$\Delta G^0_{f,GdMnO_3}$ (+/ − 425J) = −132721(+/ − 2240) + 51:91(+/ − 0:81)T $\Delta G^0_{f,GdMn_2O_5}$ (+/ − 670J) = −121858(+/ − 6176) + 79:52(+/ − 4:83)T From these data, standard G i b b s energies, enthalpies and entropies of formation of $GdMnO_3$ and $GdMn_2O_5$ from component oxides and from the elements are derived. Thermodynamic data tables for the two ternary phases are compiled from 298.15 to 1400 K.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Metallurgy and Material Science, Polish Academy of Sciences.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 16 Jan 2008
Last Modified: 18 Jan 2012 09:59
URI: http://eprints.iisc.ernet.in/id/eprint/11371

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