ABSTRACT

Thorium uranium oxide powder with uranium concentrations 10, 20, 30, 40, 50 and 70 mol% was prepared by gel combustion method. The sintering behaviour of the powders studied by dilatometry indicated that samples containing uranium up to 30 mol% had similar shrinkage behaviour with single step sintering. However, samples containing 40, 50 and 70% uranium followed two step sintering process. Though the air calcined powder shows two phase system beyond 30% uranium containing samples, sintering results into single phase system for samples containing up to 50% of uranium. The temperature programmed reduction-oxidation experiments showed that compositions containing up to 50-mol% of uranium show single reducible species throughout the temperature range. X-ray photoelectron spectroscopic studies of these sintered pellets showed presence of uranium in 6+ and 4+ oxidation states in these oxides. The experimentally determined heat capacities of solid solutions were found to have higher values than that of computed using Neumann Kopp s molar additivity rule.

Compounds

#	Formula	Name
1	O2Th	thorium dioxide
2	O2U	uranium dioxide

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 heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	DSC	58
POMD	1	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	From pellet mass and volume	1
POMD	1	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	1	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	ARCHIM	1
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	DSC	58
POMD	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	From pellet mass and volume	1
POMD	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	ARCHIM	1
POMD	1 2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Mole fraction - 1; Crystal Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	DSC	464
POMD	1 2	Mass density, kg/m3 ; Crystal	Mole fraction - 1; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal	Crystal	From pellet mass and volume	8
POMD	1 2	Mass density, kg/m3 ; Crystal	Mole fraction - 1; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal	Crystal	X-ray diffraction	8
POMD	1 2	Mass density, kg/m3 ; Crystal	Mole fraction - 1; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal	Crystal	ARCHIM	8

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Oxidation and thermo physical studies of non-stoichiometric thorium uranium oxides prepared by gel combustion method

Pai, R. V.[Rajesh V.], Sahu, M.[Manjulata], Pai, M. R., Jain, D.[Dheeraj], Jagannath, Mukerjee, S. K.

ABSTRACT