A study of helium mobility in polycrystalline uranium dioxide

Garcia, Philippe; Martin, Guillaume; Desgardin, P.; Carlot, G.; Sauvage, Thierry; Sabathier, C.; Castellier, Etienne; Khodja, H.; Barthe, M.F.

doi:10.1016/j.jnucmat.2012.06.001

Cited by 24 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Labels for these samples (i.e. B1, B2, B3, B5, B6) have been previously attributed [5]. Note that it has been checked that no surface flaking underwent as a result of the thermal annealing even if they were performed at high temperatures (above 1000 °C) [25].…”

Section: A Sample Preparation and Ion Implantationsmentioning

confidence: 99%

“…For ex-situ measurements, the analyzed UO 2 sintered disk was spinned around an axis perpendicular to its surface. The five sintered disks (labelled B1 to B6), taken from a previous work [5], were also analyzed with this setup. Note that these samples were only characterized after this isothermal annealing.…”

Section: Laboratory Xrd For Ex-situ and In-situ Measurementsmentioning

confidence: 99%

“…Durations chosen for these isothermal thermal treatments are basically higher at low temperature than at high: they range from 0.5 up to 64 hours. Finally, samples coming from a previous work [5], and labelled B2 to B6 were annealed isothermally under vacuum at high temperatures (between 750 and 1100 °C) during few hours or even less. Sample B1 has not been annealed and is kept as a reference.…”

Section: Thermal Treatment Conditionsmentioning

confidence: 99%

“…The behavior of He in UO 2 has been extensively analyzed mainly in the frame of long-term disposal of spent nuclear fuel, where helium is produced by the alpha-decay of actinides produced during in-pile irradiation [1]- [3]. Such studies have included many aspects: He behavior (lattice location [4], diffusion and precipitation [5]- [7] [8]) but also created defect [9] and the induced strains in the UO 2 matrix [10]. Different approaches have been used to produce relevant samples: aging of UO 2 samples doped with short -lived α-emitters [7][8] [11]- [15], infusion [16], or ion implantation [1] [5].…”

Section: Introductionmentioning

confidence: 99%

“…The first ion energy offers the possibility to work on implanted layers with a well-defined mechanical behavior at room temperature and which present a simple in-depth strain profile [17] [20] [18]. The second ion energy has been chosen to enable a direct comparison of strain relaxation kinetics with He release kinetics [5] [6]. Finally these strain relaxation kinetics will be compared to those measured in He implanted UO 2 {111} single crystal [22] and self-irradiated UO 2 samples.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Strain relaxation in He implanted UO2 polycrystals under thermal treatment: An in situ XRD study

Palancher

Kachnaoui

Martin

et al. 2016

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

Within the frame of the long-term evolution of spent nuclear fuel in dry disposal, the behavior of He in UO 2 polycrystals has to be studied. In this paper, strain relaxation in He implanted samples have been characterized using in-situ X-ray diffraction during thermal annealing. The influence of a wide range of experimental parameters (annealing atmosphere, He ion energy, orientation of the UO 2 grains probed by X-rays) has been evaluated. If each of them contributes to the strain relaxation kinetics in the implanted layer, strain relaxation is not completed for temperatures below 900 °C which is equivalent to what has been found on He implanted UO 2 single crystals, or aged UO 2 pellets doped with α-emitters. This stands for an additional evidence of the interest of ion implantation to simulate self-irradiation in spent nuclear fuel. Moreover, in the case of implantation with 500 keV He ions, we clearly show that strain relaxation and He release are not correlated for temperatures below 750 °C and demonstrate that this applied in-situ approach is well-suited for measuring strains in ion implanted polycrystals.

show abstract

Section: A Sample Preparation and Ion Implantationsmentioning

confidence: 99%

Section: Laboratory Xrd For Ex-situ and In-situ Measurementsmentioning

confidence: 99%

Section: Thermal Treatment Conditionsmentioning

confidence: 99%