Uranium release and secondary phase formation during unsaturated testing of UO2 at 90°C

Wronkiewicz, David J.; Bates, J. K.; Gerding, T.J.; Veleckis, E.; Tani, B.

doi:10.1016/0022-3115(92)90081-u

Cited by 233 publications

(179 citation statements)

References 17 publications

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“…The relative peak height ratios of Si:U:K for boltwoodite also match well with stoichiometric ratios of 1:l:l for boltwoodite when compared with the 3:l:l ratio exhibited by the weeksite phase. These ratios also match with a boltwoodite phase previously identified as an alteration product on uranium oxide pellets 1 [51]. In addition to the potassium uranyl silicates, both haiweeite (Fig.…”

supporting

confidence: 84%

Radiation effects in moist-air systems and the influence of radiolytic product formation on nuclear waste glass corrosion

Wronkiewicz¹,

Bates²,

Buck³

et al. 1997

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supporting

confidence: 84%

Radiation effects in moist-air systems and the influence of radiolytic product formation on nuclear waste glass corrosion

Wronkiewicz¹,

Bates²,

Buck³

et al. 1997

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“…The Si02-and CO2-bearing system are important in Nature, and the uranyl silicates and uranyl carbonates have been identified as potentially important U ( w alteration phases of U-bearing waste forms [2,3]. The mobility of U(VI) in carbonate groundwaters is potentially high, as uranyl-carbonate complexes are generally quite stable in solution [4].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Stabilities of U(VI) Minerals: Estimated and Observed Relationships

Finch

1996

MRS Proc.

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DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employes, make any warranty, express or implied, or as~mes any legal liability or respomiiIity for the accluacy, completeness, or usefulness of any information, appa- ABSTRACTGibbs free energies of formation (AG'f) for several structurally related U(vI) minerals are estimated by summing the Gibbs energy contributions from component oxides. The estimated AGof values are used to construct activity-activity (stability) diagrams, and the predicted stability fields are compared with observed mineral occurrences and reaction pathways. With some exceptions, natural occurrences agree well with the mineral stability fields estimated for the systems Si02-CaO-UO3-H20 and C02-Ca0-U03-H207 providing confidence in the estimated thermodynamic values. Activity-activity diagrams are sensitive to small differences in AGof values, and mineral compositions must be known accurately, including structurally bound H20. The estimated AGof values are not considered reliable for a few minerals for two major reasons:(1) the structures of the minerals in question are not closely similar to those used to estimate the AGf* values of the component oxides, and/or (2) the minerals in question are exceptionally fine grained, leading to large surface energies that increase the effective mineral solubilities.

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“…Study of these phases is important in the context of uranium use as nuclear fuel. Related problems include sites of old mining, ore dressing settling pits, mine dumps or even spent nuclear fuel ("SNF") management (Finch and Ewing 1992;Wronkiewicz et al 1992Wronkiewicz et al , 1996Finn et al 1996;Murakami et al 1997;Finch et al 1999;Fayek et al 2000;Čejka 2002;Shueneman et al 2003;Catalano et al 2004;Pittauerová and Goliáš 2006;Catalano et al 2006;Procházka 2007;Procházka et al 2009). Uranyl phosphates occur commonly as abundant phases in the supergene zones of most uranium deposits (Finch and Murakami 1999).…”

Section: Introductionmentioning

confidence: 99%

The question of water content in parsonsite: a model case - occurrence at the Červené žíly vein system, Jáchymov (St. Joachimsthal), Czech Republic

Plášil¹,

Čejka²,

Sejkora³

et al. 2012

J. Geosci.

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Strongly altered gangue, containing rich crystalline aggregates of parsonsite, was recently found at the outcrop parts of the Červené žíly vein system, the Jáchymov ore district, Czech Republic. Mineralogical research proved that in the crystal structure of parsonsite from Jáchymov is present a higher content of molecular water than expected. This conclusion is supported by the results of thermogravimetric analysis and infrared spectroscopy. The weight loss obtained from TG curve is 3.70 wt. %, corresponding to 1.93 mols of H 2 O. The presence of a broad vibration band reflecting the O-H stretching vibrations of molecular water was ascertained in the infrared spectrum of studied parsonsite sample, suggesting that H 2 O molecules are involved in the hydrogen-bonding network in the crystal structure of studied parsonsite. Inferred hydrogen bond lengths can vary in the range 2.6-3.0 Å, which is consistent with the distance between possible position of the molecular water and nearest neighbouring oxygen atom in the crystal structure of the synthetic parsonsite given in the literature. The chemical composition of the studied parsonsite from Jáchymov, 47.27 PbO, 13.38 P 2 O 5 , 1.

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Uranium release and secondary phase formation during unsaturated testing of UO2 at 90°C

Cited by 233 publications

References 17 publications

Radiation effects in moist-air systems and the influence of radiolytic product formation on nuclear waste glass corrosion

Radiation effects in moist-air systems and the influence of radiolytic product formation on nuclear waste glass corrosion

Thermodynamic Stabilities of U(VI) Minerals: Estimated and Observed Relationships

The question of water content in parsonsite: a model case - occurrence at the Červené žíly vein system, Jáchymov (St. Joachimsthal), Czech Republic

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