Experimental evidence for inhibitor-controlled mechanism of nanocrystallisation in amorphous metallic alloys
Institut für Festkörper- und Werkstofforschung Dresden
Postfach 270016, D-01171 Dresden, Germany
2 Hahn-Meitner-Institut Berlin - Glienicker Str. 100, D-14109 Berlin, Germany
Accepted: 18 May 2000
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.
PACS: 05.70.Fh – Phase transitions: general studies / 61.43.Dq – Amorphous semiconductors, metals, and alloys / 61.46.+w – Clusters, nanoparticles, and nanocrystalline materials
© EDP Sciences, 2000