Opposite correlations between cation disordering and amorphization resistance in spinels versus pyrochlores
journal contributionposted on 2016-01-05, 11:12 authored by B.P. Uberuaga, Ming Tang, C. Jiang, James A. Valdez, Roger Smith, Yongqiang Wang, K.E. Sickafus
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.
- Mathematical Sciences
Published inNature Communications
CitationUBERUAGA, B.P. ...et al., 2015. Opposite correlations between cation disordering and amorphization resistance in spinels versus pyrochlores. Nature Communications, 6, 8750.
Publisher© The Authors. Published by Nature Publishing Group
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Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
NotesThis is an Open Access Article. It is published by Nature Publishing Group under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/