Opposite correlations between cation disordering and amorphization resistance in spinels versus pyrochlores.

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 Commun

journal_title

Nature communications

authors

Uberuaga BP,Tang M,Jiang C,Valdez JA,Smith R,Wang Y,Sickafus KE

doi

10.1038/ncomms9750

subject

Has Abstract

pub_date

2015-10-29 00:00:00

pages

8750

issn

2041-1723

pii

ncomms9750

journal_volume

6

pub_type

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