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Thermodynamic Data for Mn3O4, Mn2O3 and MnO2

Jacob, KT and Kumar, A and Rajitha, G and Waseda, Y (2011) Thermodynamic Data for Mn3O4, Mn2O3 and MnO2. In: High Temperature Materials and Processes, 30 (4-5). pp. 459-472.

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Official URL: http://www.degruyter.com/view/j/htmp.ahead-of-prin...

Abstract

Thermodynamic properties of Mn3O4, Mn2O3 and MnO2 are reassessed based on new measurements and selected data from the literature. Data for these oxides are available in most thermodynamics compilations based on older calorimetric measurements on heat capacity and enthalpy of formation, and high-temperature decomposition studies. The older heat capacity measurements did not extend below 50 K. Recent measurements have extended the low temperature limit to 5 K. A reassessment of thermodynamic data was therefore undertaken, supplemented by new measurements on high temperature heat capacity of Mn3O4 and oxygen chemical potential for the oxidation of MnO1-x, Mn3O4, and Mn2O3 to their respective higher oxides using an advanced version of solid-state electrochemical cell incorporating a buffer electrode. Because of the high accuracy now achievable with solid-state electrochemical cells, phase-equilibrium calorimetry involving the ``third-law'' analysis has emerged as a competing tool to solution and combustion calorimetry for determining the standard enthalpy of formation at 298.15 K. The refined thermodynamic data for the oxides are presented in tabular form at regular intervals of temperature.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Walter de Gruyter GmbH & Co. KG.
Keywords: Heat capacity;entropy;enthalpy of formation;gibbs energy of formation;solid-state electrochemical cell;buffer electrode; assessment
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 09 Mar 2012 11:05
Last Modified: 12 Mar 2012 09:27
URI: http://eprints.iisc.ac.in/id/eprint/43875

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