Abstract
Mössbauer spectroscopy has been used in Fe ( SiO 2, BN) granular solids in order to elucidate the large differences in their coercivity values. The Mössbauer data suggest a core/shell morphology for the Fe SiO 2 films with an Fe(Si) core surrounded by an FeSiO shell whose surface consists of Fe 2+SiO particles. In Fe BN the data indicate the presence of amorphous FeB particles in a BN matrix.
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