Abstract
The Mossbauer effect and thermal expansion of rapidly quenched amorphous FexY1-x (0.4<or=x<or=0.8) and (FexCo1-x)0.8Y0.2 (0.4<or=x<or=1.0) alloys were studied to clarify the local environmental effect on the Fe magnetic moments and its contribution to the magnetovolume effect. The Fe atom in the rapidly quenched amorphous Fe-Y alloys has a magnetic moment when it has more than six Fe neighbours. The Fe magnetic moment increases with increasing average number of Fe neighbours n and has a maximum of about 1.9 mu B at n approximately=10-11.