ABSTRACT

The molar enthalpy of mixing (?mixHm) in the LaI3- MI (M = Na, K, Cs) liquid systems was measured over the whole composition range at 1060 K with a Calvet-type high temperature microcalorimeter. The mixing of two liquid components was achieved by using the break-off ampoule technique . The dependence of the interaction parameter on composition ? =A+Bx + Cx2 + Dx3 (x = mole fraction of LaI3) was determined. Unknown molar enthalpy of mixing (?mixHm) in the LaI3-LiI and LaI3-RbI liquid systems was calculated using the conformal solution theory of Davis. In all systems under investigation the enthalpies of mixing are negative except the LaI3-LiI system at LaI3-rich compositions. The minimum of enthalpy is shifted toward the alkali metal iodide-rich part and is located at the composition of x(LaI3) 0.35-0.40. Measured and calculated molar enthalpies of mixing were compared with the molar enthalpies of mixing in the LaCl3-MCl and LaBr3-MBr (M = Li, Na, K, Rb, Cs) liquid systems.

Compounds

#	Formula	Name
1	I3La	lanthanum triiodide
2	INa	sodium iodide
3	IK	potassium iodide
4	CsI	cesium iodide

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	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Calvet calorimetry	13
POMD	3 1	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Calvet calorimetry	11
POMD	4 1	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Calvet calorimetry	8

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Enthalpies of Mixing in the LaI3-MI (M = Li, Na, K, Rb, Cs) Binary Systems

Pilarek, B.[Bozena], Rycerz, L.[Leszek], Chojnacka, I.[Ida], Gaune-Escard, M.[Marcelle]

ABSTRACT