ABSTRACT

RE6UO12(s) (RE = La, Pr, Nd, Sm) was synthesized by citrate-nitrate combustion method. The synthe-sis condition for Pr6UO12(s) was optimized. Nonstoichiometry in these rare earth uranates in argonatmosphere was analysed using various techniques like thermogravimetry (TG), X-ray photo electronspectroscopy (XPS), chemical analysis and electrical conductivity measurements. Thermal expansions ofRE6UO12(s) (RE = Pr and Sm) was studied in the temperature range 298 1273 K by high temperature X-raypowder diffractometry and compared with that of similar rare earth compounds reported in the litera-ture. Heat capacity of RE6UO12(s) (RE = La, Pr, Nd, Sm) was measured by differential scanning calorimetryin the temperature range 300 870 K. Enthalpy, entropy and Gibbs energy functions of these compoundswere computed from the measured heat capacity data.

Compounds

#	Formula	Name
1	La6O12U	lanthanum uranium oxide
2	O12Pr6U	praseodymium uranium oxide (Pr6UO12)
3	Nd6O12U	neodymium uranium oxide (Nd6UO12)
4	O12Sm6U	samarium uranium oxide

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 heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	58
POMD	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	X-ray diffraction	12
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	61
POMD	3	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	3	Electrical conductivity, S/m ; Crystal	Temperature, K; Crystal		Crystal Air at 1 atmosphere	Alternating current cell with electrodes	8
POMD	3	Electrical conductivity, S/m ; Crystal	Temperature, K; Crystal		Crystal Gas	Alternating current cell with electrodes	8
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	58
POMD	4	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	X-ray diffraction	12
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	58

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Investigation on thermophysical properties of RE6UO12(s) (RE = La, Pr, Nd, Sm)

Sahu, M.[Manjulata], Krishnan, K., Jain, D.[Dheeraj], Saxena, M. K., Dash, S.[Smruti]

ABSTRACT