STRUCTURE OF THE AMORPHOUS PHASE DURING CRYSTALLIZATION OF FE73.5CU1NB3SI13.5B9 ALLOY

Mossbauer spectroscopy and the positron annihilation technique have been used to investigate the structure of the amorphous phase of Fe73.5Cu1Nb3Si13.5B9 nanocrystalline alloy annealed at different temperatures. The results show that there is a weak ferromagnetic amorphous boundary with a low hyperfine field. On other hand, the results of positron annihilation indicate that a large amount of vacancy-like defects appears in the amorphous phase at higher temperature. The results of magnetic measurements indicate that the magnetic properties of nanocrystalline alloy are closely related to the density of defects.