Comparison of morphologies of a uranyl peroxide precursor and calcination products

Tamasi, Alison L.; Cash, Leigh J.; Mullen, W Tyler; Ross, A. R.; Ruggiero, Christy E.; Scott, Brian L.; Wagner, Gregory L.; Walensky, Justin R.; Zerkle, Sandra A.; Wilkerson, Marianne P.

doi:10.1007/s10967-016-4692-x

Cited by 25 publications

(16 citation statements)

References 26 publications

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“…Freshly-prepared S1 is characterized as having clumped/massive agglomerates composed of sub-particles having a rounded/sub-rounded habit of semirounded grains arranged in irregular clumps that are somewhat rough and have a similar appearance as the solution-grown UO 2 (O 2 )ÁxH 2 O (see Table 2) (vide supra). The sub-particles in this image are [0.5 lm, but an image of a-U 3 O 8 from a replicate synthesis showed the same morphology in sub-particles that were \0.5 lm [16]. Comparison of the images of the precursor UO 2 (O 2 )ÁxH 2 O with those of S1 indicated that morphology was maintained following calcination of the uranyl peroxide precipitate to the uranium oxide product.…”

Section: Resultsmentioning

confidence: 79%

“…The S1 was prepared by calcination of UO 2 (O 2 )ÁxH 2 O as described in references [2] and [16], and the p-XRD analysis of S1 revealed that it was phase-pure a-U 3 O 8 . An image collected from S1 is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The preparation of a-U 3 O 8 (S1) is described elsewhere [2,16]. The phase purity was confirmed by p-XRD analysis.…”

Section: Synthesesmentioning

confidence: 99%

“…Process variables inherent in the synthesis of nuclear materials are known to influence the morphology of uranium oxide products [4,[6][7][8][9][10][11][12][13][14][15]. In particular, comparison of the morphology of precipitates with those of subsequent calcination products suggests that microstructures of the precursor precipitates are retained through heat treatment [6][7][8][13][14][15][16]. A number of studies have shown that U 3 O 8 , a common intermediate in the production of nuclear material, generates schoepite phases (UO 3 ÁxH 2 O) during storage under higher relative humidities presumably following oxidation and/or hydration [2,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…SEM images of a-U 3 O 8 (S1) at time 0[16] (left) and after storage for 2 years under Conditions 1-4 (center and right)…”

mentioning

confidence: 99%

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Morphology of U3O8 materials following storage under controlled conditions of temperature and relative humidity

Tamasi

Cash

Mullen

et al. 2016

J Radioanal Nucl Chem

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Changes in the visual characteristics of uranium oxide surfaces and morphology following storage under different conditions of temperature and relative humidity may provide insight into the history of an unknown sample. Sub-samples of three a-U 3 O 8 materials-one that was phase-pure and two that were phase-impure-were stored under controlled conditions for two years. Scanning electron microscopy was used to image the oxides before and after storage, and a morphology lexicon was used to characterize the images. Temporal changes in morphology were observed in some sub-samples, and changes were greatest following exposure to high relative humidity.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

“…The preparation of a-U 3 O 8 (S1) is described elsewhere [2,16]. The phase purity was confirmed by p-XRD analysis.…”

Section: Synthesesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…SEM images of a-U 3 O 8 (S1) at time 0[16] (left) and after storage for 2 years under Conditions 1-4 (center and right)…”

mentioning

confidence: 99%

See 3 more Smart Citations

Morphology of U3O8 materials following storage under controlled conditions of temperature and relative humidity

Tamasi

Cash

Mullen

et al. 2016

J Radioanal Nucl Chem

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Hyperspectral X-ray Imaging with TES Detectors for Nanoscale Chemical Speciation Mapping

et al. 2020

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Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

Thompson

Stennett

Gilbert

et al. 2021

J Radioanal Nucl Chem

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Uranyl oxalate (UO2C2O4·xH2O) may exist at the back-end of the nuclear fuel cycle (NFC) as an intermediate in spent fuel reprocessing. The conditions used in aqueous reprocessing and thermal treatment can affect the physical and chemical properties of the material. Furthermore, trace impurities, such as Fe, may incorporate into the structure of these materials. In nuclear forensics, understanding relationships between processing variables aids in determination of provenance and processing history. In this study, the thermal decomposition of UO2C2O4·3H2O and phase analysis of its thermal products are examined. Their morphologies are discussed with respect to a matrix of solution processing conditions.

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Comparison of morphologies of a uranyl peroxide precursor and calcination products

Cited by 25 publications

References 26 publications

Morphology of U3O8 materials following storage under controlled conditions of temperature and relative humidity

Morphology of U3O8 materials following storage under controlled conditions of temperature and relative humidity

Hyperspectral X-ray Imaging with TES Detectors for Nanoscale Chemical Speciation Mapping

Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

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