Journal Article

FZJ-2022-02140

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Monazite-type SmPO4 as potential nuclear waste form: Insights into radiation effects from ion-beam irradiation and atomistic simulations

Leys, J. M. (Corresponding author) ; Ji, Y. ; Klinkenberg, M.FZJ* ; Kowalski, P. M.FZJ* ; Schlenz, H.FZJ* ; Neumeier, S.FZJ* ; Bosbach, D.FZJ* ; Deissmann, G.FZJ*

2022
MDPI Basel

This record in other databases:      

Please use a persistent id in citations: http://hdl.handle.net/2128/31205  doi:10.3390/ma15103434

Abstract: Single-phase monazite-type ceramics are considered as potential host matrices for the conditioning of separated plutonium and minor actinides. Sm-orthophosphates were synthesised andtheir behaviour under irradiation was investigated with respect to their long-term performance in the repository environment. Sintered SmPO4 pellets and thin lamellae were irradiated with 1, 3.5,and 7 MeV Au ions, up to fluences of 5.1 × 1014 ions cm−2 to simulate ballistic effects of recoiling nuclei resulting from α-decay of incorporated actinides. Threshold displacement energies for monazite-type SmPO4 subsequently used in SRIM/TRIM simulations were derived from atomistic simulations. Raman spectra obtained from irradiated lamellae revealed vast amorphisation at the highestfluence used, although local annealing effects were observed. The broadened, but still discernible, band of the symmetrical stretching vibration in SmPO4 and the negligible increase in P–O bondlengths suggest that amorphisation of monazite is mainly due to a breaking of Ln–O bonds. PO4 groups show structural disorder in the local environment but seem to behave as tight units. Annealingeffects observed during the irradiation experiment and the distinctively lower dose rates incurred in actinide bearing waste forms and potential α-radiation-induced annealing effects indicatethat SmPO4-based waste forms have a high potential for withstanding amorphisation.

---

Contributing Institute(s):

1. Nukleare Entsorgung (IEK-6)
2. IEK-13 (IEK-13)

Research Program(s):

1. 1411 - Nuclear Waste Disposal (POF4-141) (POF4-141)
2. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2022

---

Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; Fees ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---