Navegando por Autor "Bryan, A. M."

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    Mössbauer studies of nano-sized aluminum-substituted maghemites.
    (1994) Costa, Geraldo Magela da; Grave, Eddy De; Bryan, A. M.; Bowen, L. H.
    Several Al-maghemites prepared from Al-lepidocrocites have been studied by M6ssbauer spectroscopy from 6 to 300 K, and also at 4.2 K with an applied field of 6 T. A linear decrease in the A and B site fields at 4.2 K for samples containing up to 10% of aluminum suggests a limit for the substitution. The importance of applied-field measurements for a correct characterization of small-particle maghemite is also shown.