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Your search keyword '"Dieste Blanco, O."' showing total 3 results
Start Over Author "Dieste Blanco, O." Publisher elsevier b.v.
3 results on '"Dieste Blanco, O."'

2. Synthesis and characterization of nanocrystalline U$_{1-x}$Pu$_{x}$O$_{2(+y)}$ mixed oxides

Author

Kauric, G., Walter, O., Beck, A., Schacherl, B., Dieste Blanco, O., Vigier, J.-F., Zuleger, E., Vitova, T., and Popa, K.

Subjects
Hydrothermal decomposition, Oxide nuclear fuel, Technology, Oxalate, Uranium, HR-XANES, ddc:600, Plutonium
Abstract

We report here the first synthesis of mixed oxide U$_{1-x}$Pu$_{x}$O$_{2(+y)}$ nanoparticles. The obtained nanopowders were characterized by X-ray diffraction, thermal ionization mass spectrometry, transmission electron microscopy, Raman spectroscopy, and U M$_{4}$ edge high-energy-resolution X-ray absorption near edge structure (HR-XANES). The HR-XANES spectra give evidence for the partial oxidation of U$^{IV}$ to U$^{V}$. This novel route toward the formation of actinide–actinide solid solution opens research opportunities that are not accessible using bulk materials. We give details on the X-ray diffraction study on plutonium oxalate hexahydrate, as a reagent for the synthesis of such nanoparticles.

Published
2020

3. Innovative preparation route for uranium carbide using citric acid as a carbon source.

Author

Salvato, D., Vigier, J.-F., Dieste Blanco, O., Martel, L., Luzzi, L., Somers, J., and Tyrpekl, V.

Subjects
*URANIUM compounds, *CITRIC acid, *CARBIDES, *SINTERING, *CARBONATITES, *NANOCRYSTALS
Abstract

The preparation of uranium carbide (UC) by carbothermal reduction and its sintering into dense pellets by conventional means require high temperatures for long periods. We have developed a preparation route yielding fine UC powder with significantly increased sinterability. At first, a mixture of nanocrystalline UO 2 embedded in amorphous carbon (nano-UO 2 /C) was obtained by thermal decomposition of a gel containing solubilised uranyl nitrate and citric acid. Later, the nano-UO 2 /C powder was treated in a conventional furnace or in a modified spark plasma sintering facility at elevated temperatures (≥1200 °C) in order to obtain uranium carbide powder. The effects of initial composition, temperature, gas/vacuum atmosphere and the overall reaction kinetics are reported. [ABSTRACT FROM AUTHOR]

Published
2016
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