Cesium uranate, Cs2UO4: heat capacity and entropy from 5 to 350 K and standard Gibbs energy of formation at 298.15 K

Osborne, Darrell W.; Brletic, P. A.; Hoekstra, H.R.; Flotow, Howard E.

doi:10.1016/0021-9614(76)90076-8

Cited by 22 publications

(3 citation statements)

References 9 publications

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“…Typical clay mineral components of shales were also reacted with Cs sources in order to understand the reactions of shales and their constituent phyllosilicate minerals with Cs. The Cs-containing phases actually present in SFE are not known with certainty but frequently cited possibilities are cesium uranates, Cs2MoO4, CsI, and Cs20 (O'Hare and Hockstra, 1975;Osborne et al, 1976). Cs20 would instantly react with water to form CsOH.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Reactions of Clay Minerals and Shales with Cesium Phases from Spent Fuel Elements

Komarneni¹,

White

1981

Clays and clay miner.

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Abstract--The immobilization of soluble Cs from spent fuel elements by ion exchange and direct chemical reaction with clay minerals or shales was investigated under hydrothermal conditions. Various clay minerals or shales were reacted with likely Cs sources and water at 300 bars pressure and 100 ~ 200 ~ and 300~ for 4, 2, and 1 months, respectively. Pollucite was the principal product, but CsAISiO4 was also observed, along with unreacted or hydrothermally altered aluminosilicates. From Cs concentrations of the product solutions partition of Cs between liquid and solids was found to vary depending on the Cs source, the clay or shale phase, temperature, and run duration. For example, illite-Cs2MoO4 interactions resulted in 19, 32, and 95% fixation of added Cs at 100 ~ 200 ~ and 300~ respectively. Fixation of as much as 97% of the Cs in some solids was observed. In addition to Cs-aluminosilicates, Cs was fixed on cation-exchange sites by interlayer collapse in montmorillonite. Reactions with Cs2MoOa also produced powellite because Ca was available in the reaction mixture. The U 6+ from fl-CszUzOr was reduced to form uraninite by sulfide-and/ or organic-rich shales. (Cs,Na)z(UOz)(SizOs)z 9 4H20, an analog of weeksite, was produced in reactions with fl-CszU20r The reaction products pollucite and uraninite can immobilize much of the Cs and U from spent fuel elements because Cs in pollucite is extremely difficult to exchange and U in uraninite is insoluble.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Reactions of Clay Minerals and Shales with Cesium Phases from Spent Fuel Elements

Komarneni¹,

White

1981

Clays and clay miner.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Many of the structural studies were conducted in the 1970's. For this reason, Cs-U-O phases have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, Cs-U-O phases have been extensively studied. [1][2][3][4][5][6][7][8][9][10][11][12][13] Many of the structural studies were conducted in the 1970's. [1][2][3][4][5] Due to the limitations of X-ray diffraction then, these structural solutions are limited, typically with only approximate cesium locations and no refined oxygen positions.…”

Section: Introductionmentioning

confidence: 99%

Flux crystal growth and structural analysis of two cesium uranium oxides, Cs_2.2U₅O₁₆and Cs₂U₄O₁₃, containing multiple cation–cation interactions

et al. 2015

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Single crystals of Cs 2.2 U 5 O 16 and Cs 2 U 4 O 13 have been synthesized from a CsCl flux with the ramp rate controlling the formation of fully oxidized Cs 2 U 4 O 13 versus partially reduced Cs 2.2 U 5 O 16 . Their structures have been determined by single crystal X-ray diffraction. Cs 2.2 U 5 O 16 crystallizes in the monoclinic space group C2/m with lattice parameters a = 13.4160(5) Å, b = 15.5089(6) Å, c = 7.9723(3) Å, and β = 92.7120Ĳ10)°and Cs 2 U 4 O 13 crystallizes in the orthorhombic space group Ccmm with lattice parameters a = 13.5031(6) Å, b = 15.4048(7) Å, c = 39.5680Ĳ17) Å. The two compounds contain related uranium frameworks with disordered Cs atoms within the channels. Both structures contain multiple cation-cation interactions, CCIs, which arise due to the three dimensional nature of the framework. Magnetic properties are reported for Cs 2.2 U 5 O 16 , which contains mixed valent U. CrystEngComm This journal is † Further details of the crystal structure investigation can be obtained from the Fachinformationszentrum Karlsruhe,

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Reactions of Liquid Caesium with the Oxides of Uranium

Smith

Barker

1995

Liquid Metal Systems

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Cesium uranate, Cs2UO4: heat capacity and entropy from 5 to 350 K and standard Gibbs energy of formation at 298.15 K

Cited by 22 publications

References 9 publications

Hydrothermal Reactions of Clay Minerals and Shales with Cesium Phases from Spent Fuel Elements

Hydrothermal Reactions of Clay Minerals and Shales with Cesium Phases from Spent Fuel Elements

Flux crystal growth and structural analysis of two cesium uranium oxides, Cs_2.2U₅O₁₆and Cs₂U₄O₁₃, containing multiple cation–cation interactions

Reactions of Liquid Caesium with the Oxides of Uranium

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Cesium uranate, Cs2UO4: heat capacity and entropy from 5 to 350 K and standard Gibbs energy of formation at 298.15 K

Cited by 22 publications

References 9 publications

Hydrothermal Reactions of Clay Minerals and Shales with Cesium Phases from Spent Fuel Elements

Hydrothermal Reactions of Clay Minerals and Shales with Cesium Phases from Spent Fuel Elements

Flux crystal growth and structural analysis of two cesium uranium oxides, Cs2.2U5O16and Cs2U4O13, containing multiple cation–cation interactions

Reactions of Liquid Caesium with the Oxides of Uranium

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Product

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Flux crystal growth and structural analysis of two cesium uranium oxides, Cs_2.2U₅O₁₆and Cs₂U₄O₁₃, containing multiple cation–cation interactions