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

Author

Listed:
  • Blas Pedro Uberuaga

    (Los Alamos National Laboratory)

  • Ming Tang

    (Los Alamos National Laboratory)

  • Chao Jiang

    (Thermo-Calc Software Inc.)

  • James A. Valdez

    (Los Alamos National Laboratory)

  • Roger Smith

    (Loughborough University)

  • Yongqiang Wang

    (Los Alamos National Laboratory)

  • Kurt E. Sickafus

    (University of Tennessee)

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.

Suggested Citation

  • Blas Pedro Uberuaga & Ming Tang & Chao Jiang & James A. Valdez & Roger Smith & Yongqiang Wang & Kurt E. Sickafus, 2015. "Opposite correlations between cation disordering and amorphization resistance in spinels versus pyrochlores," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9750
    DOI: 10.1038/ncomms9750
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