Crystallization behavior of amorphous FeMo alloys

New alloys of Fe_xMo_100-x over the whole composition range have been prepared by the sputtering method. It was found by X-ray diffraction that samples with 40≤ x ≤ 80 are amorphous, while the remaining alloys are single phase with the b.c.c. structure. In this paper, we report that a very high crystallization temperature T_cr of around 1100 K has been observed from the electrical resistivity measurements for amorphous Fe_xMo_100-x samples and that T_cr rises as the molybdenum content increases. After crystallization, the magnetic properties of these samples were studied using a vibrating-sample magnetometer. The results indicate that compositional dependence of the magnetic ordering temperatures T_c of these crystallized samples can be well described by the same equation as that for as-made crystalline samples, which is T_c(x) = 39 (x - 20)^0.75 Also, further heating at high temperatures causes the segregation of α-Fe and molybdenum atoms.