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  • 1
    Electronic Resource
    Electronic Resource
    Thermally induced transformations at an ion implanted α–Fe2O3/α–Al2O3 interface: A Mössbauer spectroscopy study (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4141-4145 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermally induced chemical transformations at the interface between a 100 nm α–Fe2O3 and a polycrystalline α–Al2O3 substrate are studied and compared for the cases of the as-formed and ion bombarded interfaces. The thermal annealings are carried out under vacuum at 450 °C for different time durations and the transformations are examined by conversion electron Mössbauer spectroscopy. It is shown that in the sample prebombarded with 110 keV Ar+ ions, the formation of Fe3−xAlxO4, FeAl2O4, and FeO phases is favored at variance with a nonbombarded sample in which primarily a defective Fe3O4-y phase is produced with some amount of FeO. This difference is explained in terms of the annealing process of the oxygen vacancies produced during Ar implantation near the interfacial region. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361779
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  • 2
    Electronic Resource
    Electronic Resource
    Pulsed laser treatment of Fe2O3 film on Al2O3 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 569-571 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe2O3 film (∼110 A(ring)) on crystalline Al2O3 substrate is treated by ruby laser pulses at different energy densities up to a maximum of ∼7.5 J/cm2, and the transformations are examined by conversion electron Mössbauer spectroscopy and small-angle x-ray diffraction measurements. It is observed that transformations begin to appear in the sample at an energy density of ∼3.0 J/cm2 although significant modifications are observed only at energy densities higher than about 7.0 J/cm2. The values of hyperfine interaction parameters reveal that the laser treated samples contain FeAlO3 and FeAl2O4 phases, along with the residual α-Fe2O3 phase. The laser-mixed state undergoes structural modifications upon thermal annealing, leading to formation of the Fe3O4 phase and complete disappearance of the FeAlO3 phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345195
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    Paper (German National Licenses)
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