ABSTRACT

The work presents the measured heat capacity of the (Li1-xCax)F1+x liquid solution. Four samples with different compositions have been prepared and measured using a Differential Scanning Calorimeter. Since this technique was newly adopted for measuring encapsulated fluoride samples, some modifications were introduced in the standard configuration of the instrument and they are described in this work as well. For comparison one of the analysed composition (xCaF2 = 0.5) was also measured using drop calorimetry, which has been previously used for similar studies. The reliability of the results obtained was confirmed by the good agreement between the two techniques. Moreover, the excess heat capacity of the (Li1-xCax)F1+x liquid solution was derived and a strong deviation from the ideal behaviour was observed.

Compounds

#	Formula	Name
1	FLi	lithium fluoride
2	CaF2	calcium fluoride

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	1 2	Eutectic temperature, K ; Crystal - 1			Crystal - 1 Crystal - 2 Liquid Gas	DTA	1
POMD	1 2	Solid-liquid equilibrium temperature, K ; Liquid	Mole fraction - 2; Liquid Pressure, kPa; Liquid		Liquid Crystal - 1	DTA	1
POMD	1 2	Solid-liquid equilibrium temperature, K ; Liquid	Mole fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	DTA	3
POMD	1 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	62
POMD	1 2	Molar enthalpy, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Drop calorimetry	8

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Excess heat capacity of the (Li1-xCax)F1+x liquid solution determined by differential scanning calorimetry and drop calorimetry

Capelli, E., Benes, O., Konings, R. J. M.

ABSTRACT