Thermal evolution of high dose iron implanted sintered alumina |
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Authors: | G Marest C Donnet N Moncoffre J Tousset |
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Institution: | (1) Institut de Physique Nucléaire de Lyon, IN2P3-CNRS/Université Claude Bernard, 43, Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France |
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Abstract: | Sintered plates of alumina have been implanted at room temperature with 110 keV57Fe+ at a dose of 1.2×1017 ions.cm?2. The analysis of the Conversion Electron Mössbauer Spectrum indicated that implantation introduces iron in alumina in three charge state: Fe2+ (two components), Fe4+ and Fe0 (metallic clusters). The evolution of the iron depth distribution during annealings in oxiding or in neutral atmosphere has been followed using the Rutherford backscattering spectroscopy. Up to 800°C the profile as well as the charge states of iron evolve very slowly. A drastic change occurs' for annealing temperature around 1000°C. The total amount of iron is distributed among α-Fe2O3 and α-(Fe1?x Al x )2O3 precipitates. Some scanning electron micrographs have allowed to locate these precipitates. For highest temperature anneals, up to 1600°C, only substitutional iron remain. |
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