Abstract:
:Understanding and predicting radiation damage evolution in complex materials is crucial for developing next-generation nuclear energy sources. Here, using a combination of ion beam irradiation, transmission electron microscopy and X-ray diffraction, we show that, contrary to the behaviour observed in pyrochlores, the amorphization resistance of spinel compounds correlates directly with the energy to disorder the structure. Using a combination of atomistic simulation techniques, we ascribe this behaviour to structural defects on the cation sublattice that are present in spinel but not in pyrochlore. Specifically, because of these structural defects, there are kinetic pathways for the relaxation of disorder in spinel that are absent in pyrochlore. This leads to a direct correlation between amorphization resistance and disordering energetics in spinel, the opposite of that observed in pyrochlores. These results provide new insight into the origins of amorphization resistance in complex oxides beyond fluorite derivatives.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Uberuaga BP,Tang M,Jiang C,Valdez JA,Smith R,Wang Y,Sickafus KEdoi
10.1038/ncomms9750subject
Has Abstractpub_date
2015-10-29 00:00:00pages
8750issn
2041-1723pii
ncomms9750journal_volume
6pub_type
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