Thermochemistry of uranium compounds. VI. Standard enthalpy of formation of cesium diuranate (Cs$sub 2$$U$$sub 2$$O$$sub 7$). Thermodynamics of formation of cesium and rubidium uranates at elevated temperatures

Journal Article · Tue Dec 31 23:00:00 EST 1974 · J. Chem. Thermodyn., v. 7, pp. 831-838

DOI:https://doi.org/10.1016/0021-9614(75)90091-9· OSTI ID:4030498

O'Hare, P A.G.; Hoekstra, H R

Cesium diuranate, Cs$sub 2$$U$$sub 2$$O$$sub 7$, was reacted with 1 mol dm$sup -3$ HCl in a solution calorimeter. The enthalpy of reaction, --(46087 +- 102) cal/sub th/ mol$sup -1$, leads to a standard enthalpy of formation, $delta$$H$$sup 0$/sub f/(Cs$sub 2$$U$$sub 2$$O$$sub 7$, c, 298.15 K), of --(754.3 +-- 1.06)kcal/sub th/ mol$sup -1$. Thermodynamics of the Cs + U + O and Rb + U + O systems are discussed with particular emphasis on the formation of cesium and rubidium uranates and diuranates in nuclear reactor fuel. Formation of the monouranates is expected to predominate, although diuranates are also predicted to form, but in rather low concentrations. (auth)

• Research Organization: Argonne National Lab., IL
• NSA Number: NSA-33-025505
• OSTI ID: 4030498
• Journal Information: J. Chem. Thermodyn., v. 7, pp. 831-838, Journal Name: J. Chem. Thermodyn., v. 7, pp. 831-838; ISSN JCTDA
• Country of Publication: United Kingdom
• Language: English

Related Subjects

*CESIUM URANATES-- FORMATION HEAT
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MEDIUM TEMPERATURE
N40420* --Chemistry--Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
RUBIDIUM URANATES
THERMODYNAMICS