ABSTRACT

Low temperature heat capacity of erbium phosphate ErPO4 was measured by relaxation calorimetry (2-35 K) and adiabatic calorimetry (5 { 345 K). High-temperature enthalpies of this substance were studied by drop calorimetry in the region 357 !V 1575 K. Smoothed thermodynamic properties (heat capacity, entropy, enthalpy change and derived Gibbs energy) were calculated in the range 0-1600 K. Gibbs energy of formation of ErPO4 was estimated using the standard entropy S0(298.15 K) from this work: ' fG0(ErPO4, 298.15 K) = {1855.3 b 2.1 kJ mol {1. The Schottky heat capacity anomaly was observed in the range from 2 to 300 K.

Compounds

#	Formula	Name
1	ErO4P	erbium 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	Molar volume, m3/mol ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Relaxation Calorimetry	139
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	134
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	74
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Drop calorimetry	13
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small (less than 1 g) adiabatic calorimetry	74
POMD	1	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small (less than 1 g) adiabatic calorimetry	74

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Heat Capacity and Thermodynamic Functions of Erbium Orthophosphate ErPO4 in the Range 0-1600 K

Gavrichev, K. S., Ryumin, M. A., Tyurin, A. V., Gurevich, V. M., Khoroshilov, A. V., Komissarova, L. N.

ABSTRACT