Structural investigation of self-irradiation damaged AmO2

Prieur, Damien; Vigier, Jean-François; Wiss, T.; Janssen, André; Rothe, Jörg; Cambriani, Andrea; Somers, J.

doi:10.1016/j.jssc.2013.12.016

Cited by 21 publications

(15 citation statements)

References 37 publications

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“…However, because a delay of few weeks (for XRD) to a couple of months (for XAS) was inevitable between the laser heating/cooling treatments and the post-melting material characterisation, the samples underwent some self-irradiation damage, notably those with the highest Am content. This could be viewed as a partial explanation for the complex phase splitting and higher O/M ratio observed in the U 0.8 Am 0.2 O 2+d sample as several studies have shown that a-selfirradiation-induced structural effects on (U, Am)O 2 compounds are limited to lattice swelling reaching up to 0.8 vol.% and a small structural disorder increase [45,46,[52][53][54].…”

Section: Tablementioning

confidence: 90%

Melting behaviour of americium-doped uranium dioxide

Prieur

Lebreton

Caisso

et al. 2016

The Journal of Chemical Thermodynamics

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a b s t r a c t (Uranium + americium) mixed oxides are considered as potential targets for americium transmutation in fast neutron reactors. Their thermophysical properties and notably their melting behaviour have not been assessed properly although required in order to evaluate the safety of these compounds under irradiation. In this study, we measured via laser heating, the melting points under inert atmosphere (Ar) of U 1Àx Am x O 2±d samples with x = 0.10, 0.15, 0.20. The obtained melting/solidification temperatures, measured here, indicate that under the current experimental conditions in the investigated AmO 2 content range, the solidus line of the (UO 2 + AmO 2 ) system follows with very good agreement the ideal solution behaviour. Accordingly, the observed liquidus formation temperature decreases from (3130 ± 20) K for pure UO 2 to (3051 ± 28) K for U 0.8 Am 0.2 O 2±d . The melted and quenched materials have been characterised by combining X-ray diffraction and X-ray absorption spectroscopy.

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Section: Tablementioning

confidence: 90%

Melting behaviour of americium-doped uranium dioxide

Prieur

Lebreton

Caisso

et al. 2016

The Journal of Chemical Thermodynamics

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“…11 (Am L3). Reference spectra for the crystalline actinide(IV) dioxides UO 2 , NpO 2 , PuO 2 and AmO 2 were obtained from [37][38][39], recorded in transmission mode at the same experimental station. Data for the Am(III) aqua ion was taken from [40] and displayed in Fig.…”

Section: Xafs Analysismentioning

confidence: 99%

XAS and XRF investigation of an actual HAWC glass fragment obtained from the Karlsruhe vitrification plant (VEK)

Dardenne

González-Robles

Rothe

et al. 2015

Journal of Nuclear Materials

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“…In addition to the three single scattering paths (Me-O, Me-Me and Me-O), one multiple-scattering path (Me-OMe-O-Me) was also considered in the FEFF calculations. As often employed for An L III /L II [19][20][21][22][23][24][25], the amplitude factor (S 0 2 ) was set at 0.90 for U and Am shells. The shift in the threshold energy (ΔE 0 ) was varied as a global parameter.…”

Section: Xasmentioning

confidence: 99%