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A critical assessment of the standard molar gibbs free energy of formation of NiWO4

Raj, Markondeya P (1995) A critical assessment of the standard molar gibbs free energy of formation of NiWO4. In: Bulletin of Materials Science, 18 (5). pp. 623-630.

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Abstract

Three independent studies have been reported on the free energy of formation of NiWO4. Results of these measurements are analyzed by the �third-law� method, using thermal functions for NiWO4 derived from both low and high temperature heat capacity measurements. Values for the standard molar enthalpy of formation of NiWO4 at 298·15 K obtained from �third-law� analysis are compared with direct calorimetric determinations. Only one set of free energy measurements is found to be compatible with calorimetric enthalpies of formation. The selected value for ?f H m 0 (NiWO4, cr, 298·15 K) is the average of the three calorimetric measurements, using both high temperature solution and combustion techniques, and the compatible free energy determination. A new set of evaluated data for NiWO4 is presented.

Item Type: Editorials/Short Communications
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: "Third-law" analysis;Gibbs energy function; e.m.f, measurements;enthalpy of formation;heat capacity;entropy; phase relations.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 26 Apr 2011 06:46
Last Modified: 26 Apr 2011 06:46
URI: http://eprints.iisc.ernet.in/id/eprint/36900

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