ABSTRACT

The enthalpies of mixing of the gold lead and silver gold lead alloys were determined at 973K by using a high temperature Calvet calorimeter (400Kless than T less than 1400 K). The mixing enthalpies of Au Pb liquid are negative over the entire composition range with a minimum mixHm =-1074 J mol-1 at XAu = 0.40. The enthalpies of formation of ternary liquid alloys have been carried out along the following sections: XAg/XPb = 1/4, XAu/XPb = 1/4 and 2/3 at 973 K. Experimental values of mixHm = f(XAg, XAu) are compared with those predicted from the Kohler, Muggianu and Toop relations. An assessment including the excess ternary parameter is presented.

Compounds

#	Formula	Name
1	Au	gold
2	Pb	lead
3	Ag	silver

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	2 1	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	32
POMD	2 3	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Calvet calorimetry	1
POMD	2 3 1	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid Mole fraction - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	33

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of mixing of Au Pb and Ag Au Pb liquid alloys at 973K

Hassam, S., Gheribi, A.

ABSTRACT