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- W2016016730 abstract "Improving the understanding of dissolution mechanisms at the solid/solution interface of mixed CeIV1–xNdIIIxO2–x/2 dioxides is a critical step in the frame of generation IV (Gen IV) nuclear fuel elements that integrates minor actinides recycling. In order to give significant insight into the dissolution kinetics of Ce0.4Nd0.6O1.7 sintered samples prepared from the thermal conversion of oxalate precursors, X-ray reflectivity (XRR) and grazing incidence X-ray diffraction (GI-XRD) were used to characterize the microstructural and structural changes of the solid/solution interface and were coupled with solution analysis. The dissolution mechanism occurred in three steps. After a short period of dissolution in which no Nd release was observed, GI-XRD revealed the existence of a 200 nm depth chemical gradient below the surface formed during the early times of the dissolution. A Nd-enriched zone was located at the surface of a Nd-depleted zone. Simultaneously, XRR data showed the development of a surface layer of 40 Å of low electron density. Both results fit well with the presence of a Nd-based thin surface layer phase. Then, the Nd-based surface layer dissolved and developed microporosity, leading to a strong increase of the surface of this layer. Thus, during the initial times, the Nd-based layer mainly contributed to dissolution, which played a crucial role in the kinetics of dissolution and explained why incongruent dissolution was first observed as a transient stage to congruent dissolution. From almost 3% of mass loss, a steady state was reached, corresponding to a congruent dissolution mechanism. The duration of the transient steps depended on the alteration conditions." @default.
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- W2016016730 date "2012-05-23" @default.
- W2016016730 modified "2023-09-26" @default.
- W2016016730 title "Kinetics of Structural and Microstructural Changes at the Solid/Solution Interface during Dissolution of Cerium(IV)–Neodymium(III) Oxides" @default.
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- W2016016730 doi "https://doi.org/10.1021/jp3007602" @default.
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