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

P Markondeya Raj
1995 Bulletin of Materials Science  
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 NiWO 4 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
more » ... e compatible with calorimetric enthalpies of formation. The selected value for Af H°(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 NiWO 4 is presented.
doi:10.1007/bf02744848 fatcat:dvuzbmonpzavxpzips4rgolqzq