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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Dacheux, Nicolas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2024Speciation and chemical behavior of molybdenum in uranium dioxide samples prepared by hydroxide precipitationcitations
- 2024Speciation and chemical behavior of molybdenum in uranium dioxide samples prepared by hydroxide precipitationcitations
- 2023Synthesis and sintering of homogenous Hf1-xMIIIxO2-x/2 ceramics as solid electrolytes for oxygen sensors in liquid sodium
- 2023Understanding the solid/liquid interface evolution during the dissolution of Nd-doped UO2 by macro-/microscopic dual approachcitations
- 2022Synchrotron study of the relations between sintering conditions, structure and cation speciation in (U,Ce)O2+δ ceramics
- 2022Synthesis and sintering of homogenous Hf1-xMIIIxO2-x/2 ceramics as solid electrolytes for oxygen sensors operating in liquid sodium
- 2022Experimental approach to study the alteration of MOX MIMAS fuels in an underwater storage situation
- 2022Characterization and dissolution of (Ru, Rh, Pd, Mo)-bearing (U,Th)O2 heterogeneous mixed oxides for spent fuel modeling
- 2022Impact of impurities on the fabrication and performances of yttrium-doped thoria electrolyte ceramicscitations
- 2021The Role of Water and Hydroxyl Groups in the Structures of Stetindite and Coffinite, MSiO4 (M = Ce, U).citations
- 2020An in-situ electron microscopy study of dual ion-beam irradiated xenotime-type ErPO$_4$citations
- 2019Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate
- 2019Impact of the cationic homogeneity on Th0.5U0.5O2 densification and chemical durabilitycitations
- 2019Impact of the cationic homogeneity on Th$_{0.5}$U$_{0.5}$O$_2$ densification and chemical durabilitycitations
- 2017Synthesis and Direct Sintering of Nanosized (M IV ,M III )O 2‐ x Hydrated Oxides as Electrolyte Ceramicscitations
- 2017Study of the hydrothermal synthesis of ThSiO4, USiO4 and CeSiO4 aiming at determining the conditions of PuSiO4 formation
- 2017Novel approaches for the in situ study of the sintering of nuclear oxide fuel materials and their surrogatescitations
Places of action
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article
Impact of impurities on the fabrication and performances of yttrium-doped thoria electrolyte ceramics
Abstract
The effect of several impuritites on the life-cycle of yttria-doped thoria electrolyte was evaluated in this study. All the oxide exhibited the single-phase fluorite-type structure expected for such materials, while the variation of the unit cell parameter attested for the incorporation of the impurities in the lattice. Doping with 0.2, 0.5 or 1 wt.% of Al, Si or Zr only slightly affected the morphology of the powders, as well as the microstructure of the pellets obtained after sintering, even if a deleterious effect, leading to the embrittlement of the samples, was observed for high silicon contents. The presence of silicon and zirconium in the ceramic further modified its electrical properties. The grain conductivity was always found to decrease. Impedance spectroscopy also revealed a strong modification of the signal assigned to grain boundaries, which evidenced that impurities partially migrated during the sintering step. Finally, corrosion tests undertaken in liquid sodium at 500°C showed that the pellets were fragilized by the presence of silicon or high zirconium contents, possibly through the formation of Na2MO3 ternary oxides at the grain boundaries.From a general point of view, silicon seems to be the most harmful impurity that should be especially checked during the fabrication processes.