Abstract
Ion-beam irradiation of perovskite structures results in the production and accumulation of defects. Below a critical temperature, irradiation also leads to a crystalline-to-amorphous transformation. The critical temperature for amorphization under 800 keV Kr+ ion irradiation is 425, 440 and 550 K for SrTiO3, CaTiO3 and BaTiO3, respectively. The results of ion-channeling studies on SrTiO3 irradiated with 1.0 MeV Au2+ ions suggest that the crystalline-to-amorphous transformation is dominated by the accumulation and interaction of irradiation-induced defects. In SrTiO3 irradiated with He+ and O+ ions at 180 K, isochronal annealing studies indicate that there is significant recovery of defects on both the oxygen and cation sublattices between 200 and 400 K. These results suggest that defect recovery processes may control the kinetics of amorphization. A fit of the direct-impact/defect-stimulated model to the data for SfTiO3 suggests that the kinetics of amorphization are controlled by both a nearly athermal irradiation-assisted recovery process with an activation energy of 0.1 ± 0.05 eV and a thermal defect recovery process with an activation energy of 0.6 ± 0.1 eV. In SrTiO3 implanted with 40 keV H+ to 5.0 x 1016 and 1.0 x 1017 ions/cm2, annealing at 470 K increases the backscattering yield from Sr and Ti and is mostly likely due to the coalescence of H2 into bubble nuclei. Annealing at 570 K and higher results in the formation of blisters or large cleaved areas.
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Weber, W.J., Jiang, W., Thevuthasan, S., Williford, R.E., Meldrum, A., Boatner, L.A. (2000). Ion-Beam-Induced Defects and Defects Interactions in Perovskite-Structure Titanates. In: Borstel, G., Krumins, A., Millers, D. (eds) Defects and Surface-Induced Effects in Advanced Perovskites. NATO Science Series, vol 77. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4030-0_32
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DOI: https://doi.org/10.1007/978-94-011-4030-0_32
Publisher Name: Springer, Dordrecht
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