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The very reason for the formation of nanocrystalline states from amorphous precursors is elucidated for a Fe-based soft-magnetic alloy of Finemet type by means of neutron small-angle scattering. It is shown that the Fe(Si) nanocrystals created in the amorphous matrix during annealing are covered by Nb atoms. The accumulation of Nb atoms or Nb-B aggregates acting as inhibitors at the surface of the nanocrystals has been assumed within the framework of a recent model to be the basic mechanism controlling the evolution of the nanocrystalline state. This model is shown to be correct.
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Hermann et al. (2000) studied this question.
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