Amorphous ribbons of Fe73.5Si15.5Nb3Cu1B7-xP x (x=0,1,2,3, and 4) have been prepared by
rapid cooling on a single copper wheel. The crystallization of ?-Fe(Si) phase is independent of the P content
in the alloys. Based on Kissinger plots, the activation crystallization energies are determined. The size of the
nanoparticles crystallized on an amorphous matrix in heat-treated ribbons is found to be 10-12nm. The
crystallization fraction is determined by using thermal-analysis equipment and we show that after 30min
annealing, this fraction is over 80%. The thermomagnetic curves measured between room temperature and
1000K revealed clearly two magnetic phases: an amorphous phase at low temperatures and a crystalline one
at high temperatures. ?? 2002 Elsevier Science B.V. All rights reserved.
