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Cinétiques de dissolution des cristaux dans les silicates fondus - contexte des verres nucléaires
| Content Provider | Semantic Scholar |
|---|---|
| Author | Renaud, Judith |
| Copyright Year | 2017 |
| Abstract | This work focuses on the dissolution kinetics of rare earth (RE) silicates (Ca2RE8(SiO4)6O2 where RE=Nd) with an apatite structure in a sodium-borosilicate glass melt. Dissolution kinetics were characterized by following the crystalline area fraction by image analysis as a function of time and temperature. Then, a model based on the generalized Johnson-MehlAvrami-Kolmogorov equation is proposed to fit the experimental data. This model enables to determine both the mechanism limiting the dissolution (i.e. the diffusion) and the activation energy of crystals dissolution in the studied glass system (496 kJ/mol). To support these results, the chemical profiles at the crystal/melt interfaces are measured by microprobe. The conclusions obtained by this last method are in agreement with the conclusions based on JMAK model. All these results allowed to confirm that the JMAK model is well suited to model crystals dissolution in silicate melts. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://tel.archives-ouvertes.fr/tel-01925448/document |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |