Synthesis and crystal structure characterisation of sodium neptunate compounds

Smith, Anna; Raison, Philippe E.; Konings, R.J.M.

doi:10.1016/j.jnucmat.2011.04.009

Cited by 24 publications

(45 citation statements)

References 17 publications

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“…Reflections belonging to PuO 2 were excluded from the refinement. The formation of the isoformula Np compound with the same crystal structure has been also observed recently [3].…”

Section: Resultssupporting

confidence: 63%

“…For example, a diffraction pattern similar to sodium diuranate Na 2 U 2 O 7 [29] and sodium dineptunate Na 2 Np 2 O 7 [3] was observed in case of hydrolysis of Na 4 PuO 5 and Na 5 PuO 6 ( Fig. 11(1)).…”

Section: Hydrolysis Of the Sodium Plutonatesmentioning

confidence: 92%

“…The powders of PuO 2 and Na 2 O in appropriate ratios were ground together in an agate mortar. Sodium monoxide was added in excess of 20 mol% over the calculated amount in order to compensate for vaporization [3]. The heat treatment was performed at 400°C and 700°C for 24 h with intermediate grinding after the first 12 h. Heating was carried out either in pure argon or oxygen.…”

Section: Methodsmentioning

confidence: 99%

“…These authors reported several ternary oxides of sodium and plutonium: Na 4 Pu 2 O 5 , Na 2 PuO 3 , Na 4 PuO 4 , Na 6 PuO 5 , Na 3 PuO 4 , a-and b-Na 4 PuO 5 , Na 6 PuO 6 . More recently, a revision of the system of sodium-neptunium oxides was carried out and some discrepancies with the earlier published data were revealed [3]. That study demonstrated that many questions still remain regarding both structure and composition of the complex ternary oxides of the alkali elements and actinides.…”

Section: Introductionmentioning

confidence: 95%

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Synthesis and crystal structure investigations of ternary oxides in the Na–Pu–O system

Bykov

Raison

Konings

et al. 2015

Journal of Nuclear Materials

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“…Reflections belonging to PuO 2 were excluded from the refinement. The formation of the isoformula Np compound with the same crystal structure has been also observed recently [3].…”

Section: Resultssupporting

confidence: 63%

Section: Hydrolysis Of the Sodium Plutonatesmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Synthesis and crystal structure investigations of ternary oxides in the Na–Pu–O system

Bykov

Raison

Konings

et al. 2015

Journal of Nuclear Materials

Self Cite

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“…1 Due to large difference in the densities of the uranates and uranium/uranium oxide/mixed oxide fuel, the formation of these compounds play an important role in safety issues arising from any rupture of the cladding materials due to swelling of the fuel. 2 In addition, the uranates have applications as magnetic materials, catalysts etc. [3][4][5] Bismuth uranates are a special class of compounds having relevance in several areas e.g.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Sb-doped Bi2UO6 Solid Solutions by X-ray Diffraction and X-ray Absorption Spectroscopy

et al. 2013

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XRD measurementsPowder X-ray diffraction studies on the samples were carried out using a Cu anode-based powder diffractometer operating in the Bragg-Brentano focusing geometry, and a curved crystal monochromator in the diffraction beam. The preparation and characterization of Sb-doped Bi2UO6 solid solutions, in a limited composition range, is reported for the first time. The solid solutions were prepared by solid-state reactions of Bi2O3, Sb2O3 and U3O8 in the required stoichiometry. The reaction products were characterized by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) measurements at the Bi and U L3 edges. The XRD patterns indicate the precipitation of additional phases in the samples when Sb doping exceeds 4 at%. The chemical shifts of the Bi absorption edges in the samples, determined from the XANES spectra, show a systematic variation only up to 4 at% of Sb doping and support the results of XRD measurements. These observations are further supported by the local structure parameters obtained by analysis of the EXAFS spectra. The local structure of U is found to remain unchanged upon Sb doping indicating that Sb +3 ions replace Bi +3 during the doping of Bi2UO6 by Sb.

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Applications of Alkali Metal Hydroxide Hydrofluxes to the Synthesis of Single‐Crystal Ternary Actinide Oxides

Thomas

Stegman

Skanthakumar

et al. 2020

Chemistry A European J

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Hydrofluxes are hydrated salts with melting points well below that of the dehydrated salt and boiling points well above that of water,a ffording ar eaction medium, in which mild temperatures and pressuresc an be accessedf or the synthesis of materials. Herein, the use of alkali metal hydroxide hydrofluxes for the synthesis of single crystal a-Na 2 NpO 4 is described, and the single crystal X-ray structure of a-Na 2 NpO 4 ,a long with its X-ray absorption spectra and vibrational spectra,i sr eported. The ability to synthesize complex oxideso ft he actinides, in particular,t ransuranium materials, under mild conditions will serve to advance our ability to explore the structureproperty relationships of the fe lements.

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Synthesis and crystal structure characterisation of sodium neptunate compounds

Cited by 24 publications

References 17 publications

Synthesis and crystal structure investigations of ternary oxides in the Na–Pu–O system

Synthesis and crystal structure investigations of ternary oxides in the Na–Pu–O system

Characterization of Sb-doped Bi2UO6 Solid Solutions by X-ray Diffraction and X-ray Absorption Spectroscopy

Applications of Alkali Metal Hydroxide Hydrofluxes to the Synthesis of Single‐Crystal Ternary Actinide Oxides

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