Stability of tetravalent actinides in perovskites

Journal Article · Sun Jan 01 04:00:00 EST 1984 · ACS Symp. Ser.; (United States)

DOI:https://doi.org/10.1021/bk-1984-0246.ch020· OSTI ID:5972955

Williams, C W; Morss, L R; Choi, I K

This paper reports the first determination of the enthalpy of formation of a complex actinide(IV) oxide: ..delta..H/sub f//sup 0/ (BaUO/sub 3/,s, 298 K) = -1690 +/- 10 kJ mol /sup -1/. The preparation and properties of this and other actinide(IV) complex oxides are described and are compared with other perovskites BaMO/sub 3/. The relative stabilities of tetravalent and hexavalent uranium in various environments are compared in terms of the oxidation-reduction behavior of uranium in geological nuclear waste storage media; in perovskite, uranium(IV) is very unstable in comparison with uranium(VI). 30 references, 2 figures, 4 tables.

• Research Organization: Argonne National Lab., IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5972955
• Journal Information: ACS Symp. Ser.; (United States), Journal Name: ACS Symp. Ser.; (United States) Vol. 246; ISSN ACSMC
• Country of Publication: United States
• Language: English

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ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DATA
EXPERIMENTAL DATA
HIGH-LEVEL RADIOACTIVE WASTES
INFORMATION
MATERIALS
MINERALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE TRANSFORMATIONS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
REDOX REACTIONS
SOLIDIFICATION
SOLUBILITY
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
WASTES