Accumulation and thermal recovery of disorder in Au2+-irradiated SrTiO3

S. Thevuthasan, W. Jiang, V. Shutthanandan, W. J. Weber

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    Abstract

    Damage accumulation and thermal recovery processes have been investigated in single crystal SrTiO3(1 0 0) irradiated with 1.0 MeV Au2+ using in situ Rutherford backscattering spectrometry in channeling geometry (RBS/C). Samples were irradiated at temperatures of 170 and 300 K with ion fluences ranging from 0.10 to 0.40 Au2+/nm2. The in situ RBS/C analysis indicates that the relative disorder shows a strong sigmoidal dependence on ion dose. After an ion fluence of 0.30 Au2+/nm2 at 170 K, the buried region at the damage peak (approximately 60 nm) becomes fully amorphous, which corresponds to a dose of approximately 0.8 displacement per atom (dpa). For irradiation at 300 K, an ion fluence of 0.40 Au2+/nm2 (approximately 1.1 dpa) is necessary to achieve an amorphous state at the damage peak. An analysis of the defects dechanneling factor suggests that the irradiated regions consist mostly of interstitial atoms or amorphous clusters. In situ thermal annealing experiments were performed to study damage recovery processes up to a maximum temperature of 870 K. The thermal recovery processes occur over a broad temperature range, and the disorder created by low ion fluences, 0.10-0.27 Au2+/nm2, is almost completely recovered after annealing at 870 K.

    Original languageEnglish
    Pages (from-to)204-209
    Number of pages6
    JournalJournal of Nuclear Materials
    Volume289
    Issue number1-2
    DOIs
    Publication statusPublished - Feb 2001

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    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Materials Science(all)
    • Nuclear Energy and Engineering

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