Standard enthalpies of formation at 298.2 K for these materials were determined by solution calorimetry in 25% HF. The following values per unit cell content were obtained The resulting standard enthalpies of formation for the precursors of the reactants are: These values expressing the contribution...
Enthalpie de formation des pentafluorotellurates IV de sodium NaTeF 5 et de lithium LiTeF 5Standard enthalpies of formation of NaTeF 5 and LiTeF 5 have been determined by reaction colorimetry in a molar solution of NaOH as: ΔfH° 298NaTeF 5(c) = -1661± 4 kj.mol -1 ΔfH° 298LiTeF...
The value deduced, -27,93103 kJ mol-1, is compared to the standard enthalpies of formation of the trimagnesium and the tricalcium phosphates.doi:10.1023/B:JTAN.0000041665.41225.c3S. Ben AbdelkaderLaboratoire de Thermodynamique AppliquéeA. Ben Cherifa...
CherifaM.JemalJournal of Thermal Analysis & CalorimetryA. Ben Cherifa, M. Jemal, Enthalpie de formation et de melange de phosphoap- atites calco-cadmiees chlorees, J. Therm. Anal. Calorim. 68 (2002) 1035-1044.Ben Cherifa A, Jemal M. Enthalpie de formation et de mélange de phospho...
The enthalpy of formation of the metasilicate hydrate Na 2SiO 3.5H 2O referred to the anhydrous silicate and water was determined by solution calorimetry at 298.2 K : 59.3 ± 3.0 kJ/ mol. Some considerations on the thermochemistry of hydrates are proposed....
By direct reaction calorimetry at 737 K, the enthalpy of formation for bismuth-antimony-tellurium ternary system has been measured over the mole fraction range for tellurium of 0.55 < X Te <1. From these measurements the nature and limits of co-existence of the phases has been deduced. In ...
The standard enthalpies of formation of ammonium penta or hexafluorotellurate IV have been determined by reaction calorimetry in aqueous hydrogen fluoride as Δ fH° 298 NH 4TeF 5 = -1547 ± 15 kJ.mol -1 Δ fH° 298 (NH) 4 2TeF 6 = -2026 ± 20 kJ.mol -1...
The value deduced, -27,93路10 3 kJ mol -1 , is compared to the standard enthalpies of formation of the trimagnesium and the tricalcium phosphates.doi:10.1023/B:JTAN.0000041665.41225.c3Ben Abdelkader, S.Ben Cherifa, A.Coulet, M. V....
The enthalpy of formation of seven Cu Ni solid alloys quenched from 1323 K was determined at 300 K from the thermal effects corresponding to their dissolution into liquid germanium using a high-temperature Calvet calorimeter. The thermodynamic behaviour of these Cu Ni solid solutions is characterized...
After estimating the bismuth activity in these alloys we determined the free energy of these compounds as a function of temperature and thus deduced the enthalpy and entropy of formation of LaBi 2 and CeBi 2.doi:10.1016/0040-6031(87)88362-4A. Morisson...