TY  - JOUR
AU  - Leys, Julia M.
AU  - Ji, Yaqi
AU  - Klinkenberg, Martina
AU  - Kowalski, Piotr M.
AU  - Schlenz, Hartmut
AU  - Neumeier, Stefan
AU  - Bosbach, Dirk
AU  - Deissmann, Guido
TI  - Monazite-type SmPO4 as potential nuclear waste form: Insights into radiation effects from ion-beam irradiation and atomistic simulations
JO  - Materials
VL  - 15
IS  - 10
SN  - 1996-1944
CY  - Basel
PB  - MDPI
M1  - FZJ-2022-02140
SP  - 3434
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 35629458
UR  - <Go to ISI:>//WOS:000802681700001
DO  - DOI:10.3390/ma15103434
UR  - https://juser.fz-juelich.de/record/907661
ER  -