The thermal stability of calcium uranates in a hydrogen atmosphere
Journal Article
·
· J. Solid State Chem.; (United States)
The stability and decomposition of CaUO/sub 4/,Ca/sub 2/UO/sub 5/, and Ca/sub 3/,UO/sub 6/ on heating in hydrogen were investigated by X-ray powder diffraction and thermogravimetry. Ca/sub 2/UO/sub 5/ decomposes at 450/sup 0/C into Ca/sub 2/UO/sub 4.5/ with a triclinic unit cell. At 850/sup 0/C, it changes to monoclinic Ca/sub 2/(Ca/sub 0.67/U/sub 0.33/)UO/sub 6/ which loses some oxygen up to the composition Ca/sub 2/(Ca/sub 0.67/U/sub 0.33/)UO/sub 5.83/. At 1100/sup 0/C, it decomposs to UO/sub 2/ solid solution and CaO. CaUO/sub 4/ decomposes at 900/sup 0/C to Ca/sub 2/(Ca/sub 0.67/U/sub 0.33/)UO/sub 5.83/ and CaU/sub 2/O/sub 6/. The decomposition products of Ca/sub 3/UO/sub 6/ at 850/sup 0/C are Ca/sub 2/(Ca/sub 0.67/U/sub 0.33/)UO/sub 5.83/ and CaO.
- Research Organization:
- J. Stefan Inst. and E. Kardelj Univ., Ljubljana, Yugoslavia
- OSTI ID:
- 5613189
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 47:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
ELEMENTS
HEATING
HIGH TEMPERATURE
HYDROGEN
MEASURING METHODS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SCATTERING
STABILITY
THERMOCHEMICAL PROCESSES
THERMOGRAPHY
URANATES
URANIUM COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
ELEMENTS
HEATING
HIGH TEMPERATURE
HYDROGEN
MEASURING METHODS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SCATTERING
STABILITY
THERMOCHEMICAL PROCESSES
THERMOGRAPHY
URANATES
URANIUM COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION