Structural and thermodynamic characterization of the perovskite-related Ba{sub 1+y}UO{sub 3+x} and (Ba, Sr){sub 1+y}UO{sub 3+x} phases
Journal Article
·
· Journal of Solid State Chemistry
- Netherlands Energy Research Foundation, Petten (Netherlands); and others
The perovskite-type BaUO{sub 3} structure has been investigated by X-ray and neutron diffraction. The Ba/U ratio, the (Ba, Sr)/U ratio, and the oxygen stoichiometry in Ba{sub 1+y}UO{sub 3+x} were varied, and the integral enthalpies of formation were determined by solution calorimetry. In addition, equilibrium oxygen partial pressures were measured using a reversible EMF cell. The chemical defect mechanism is discussed, and it is shown that the continuous series BaUO{sub 3}-Ba{sub 1+y}UO{sub 3+x}-Ba{sub 3}UO{sub 6} exists in which uranium vacancies are gradually filled with barium ions whereas uranium is oxidized via the pentavalent to the hexavalent state in Ba{sub 3}UO{sub 6 }(= Ba{sub 2} (Ba, U) O{sub 6}).
- OSTI ID:
- 576436
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 131; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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