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Radiation tolerance of complex oxides

Sickafus1, Minervini, Grimes

  • 1Division of Materials Science and Technology, MS-G755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Department of Materials, Imperial College, Prince Consort Road, London SW7 2BP, UK. The Institute of Scientific and Industrial Re.

Science (New York, N.Y.)
|August 5, 2000
PubMed
Summary

Complex oxides with fluorite structures show better radiation resistance than pyrochlores. This finding helps tailor materials for nuclear waste storage, improving chemical durability and radiation tolerance.

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Solid State Chemistry

Background:

  • Complex oxides are crucial for actinide and radioactive waste immobilization.
  • Understanding radiation tolerance is vital for long-term waste management.
  • Lattice defect accommodation influences material stability under irradiation.

Purpose of the Study:

  • To predict and compare the radiation performance of complex oxides.
  • To investigate the role of crystal structure (fluorite vs. pyrochlore) in radiation resistance.
  • To guide the selection of durable host materials for radioactive waste.

Main Methods:

  • Predicting radiation performance based on lattice point defect accommodation.
  • Utilizing computational calculations for defect propensity analysis.

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  • Conducting preliminary radiation damage experiments.

    • Main Results:

    • Fluorite structured oxides exhibit a higher propensity to accommodate radiation-induced defects compared to pyrochlores.
    • Experimental data confirm that fluorites are inherently more radiation resistant than pyrochlores.
    • The crystal structure significantly impacts the radiation tolerance of complex oxides.

    Conclusions:

    • Material's propensity to accommodate lattice defects is a key predictor of radiation performance.
    • Fluorite and pyrochlore structures show distinct differences in radiation resistance.
    • Tailoring chemical durability and radiation tolerance of waste hosts is achievable by selecting appropriate crystal structures.