ABSTRACT

High-temperature enthalpy increments of monazite-type EuPO4 and SmPO4 were measured by drop calorimetry in the temperature range 450 1570K and the heat capacity was derived. The excess heat capacity Cexs was calculated by subtracting the lattice heat capacity, interpolated from isostructural LaPO4 (4f0) and GdPO4 (4f7) compounds. A good agreement was found with Cexs calculated from (estimated) crystal field energies. The heat capacity of PrPO4 was estimated with this approach.

Compounds

#	Formula	Name
1	EuO4P	europium phosphate
2	O4PSm	samarium phosphate

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	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Lower temperature, K; Crystal Upper temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	12
POMD	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Lower temperature, K; Crystal Upper temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	13

Thermodynamics Research Center / ThermoML | Thermochimica Acta

High-temperature heat capacities of EuPO4 and SmPO4 synthetic monazites

Popa, K., Konings, R. J. M.

ABSTRACT