Jean-Claude Mathieu

Calorimetric investigation on the CdTe binary alloys

Abstract The enthalpy of formation of the CdTe solid and liquid alloys was measured by direct reaction calorimetry (DRC) (drop method) at 737 and 1259 K with the help of a Tian-Calvet high temperature calorimeter. The DRC procedure used was very simple at 737 K but more sophisticated at 1259 K due to the high vapor pressures of both components. This allowed us to determine the enthalpy of formation of the CdTe solid compound in agreement with the data of the literature and the enthalpy of formation of the melts in the whole range of concentration.

Enthalpie de melange du systeme vitreux albite-orthose (Na,K) AlSi3O8

Abstract Using a high temperature Calvet calorimeter the authors have measured the enthalpy of dissolution of vitreous albite, orthose and their mixtures into a 2PbO+B 2 O 3 liquid bath at 970 K. From these values, the enthalpy of mixing the vitreous system albite-orthose (Na, K) AlSi 3 O 8 at this temperature has been deduced.

Influence of the short-range chemical order effect on the partial interference functions of a dilute binary liquid alloy

Abstract An evaluation of the partial interference functions for a dilute binary liquid alloy in terms of the interference function of the solvent is presented. The calculation neglects size effects, but the influence of the short-range chemical order effect on the partial interference functions is studied. A quasichemical statistical treatment allows a calculation of the chemical effect to be made Results are presented for dilute alloys of Zn[sbnd]Al and Cu[sbnd]Sb and a direct comparison with experiment is made in the case of liquid Ag0.285 Li0.715.

Enthalpie de formation de l'hydrate Na2SiO3. 5H2O

Abstract The enthalpy of formation of the metasilicate hydrate Na 2 SiO 3 .5H 2 O 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.

Experimental determination of the partial enthalpies of mixing of tin and tellurium in SnTe melts

Abstract The partial molar enthalpies of Sn and Te at high dilution in SnTe melts have been measured by direct reaction calorimetry (drop method) with the help of a Tian-Calvet high temperature calorimeter, at 860, 1000 and 1100 K. They show only very weak temperature dependence. The values of the interaction parameters were also measured. The results obtained will be used to compare the different models available for strongly interacting liquid alloys.