MAGNETIC-PROPERTIES OF FE-BASED ICOSAHEDRAL CLUSTER AMORPHOUS-ALLOYS

Structural and magnetic studies of amorphous RE(Fe1-xAlx)13 alloys (RE = rare earth metal) have been carried out. These alloys consisted of icosahedral clusters which exist in the crystalline state. The nearest -neighbor distance of the Fe-Fe pairs is about 2.5 angstrom. Their iso mer shifts are almost the same, suggesting a similar electronic state. These alloys exhibit a re-entrant spin-glass behavior and the spin fr eezing temperature is hardly changed by replacing RE because there is not change in the Fe-Fe distance in the icosahedral clusters. On the c ontrary, the Curie temperature depends on the RE in a similar manner t o that of many Fe-based amorphous alloys.