Temperature dependence of the electrical resistivity in some amorphous ferromagnetic alloys

Temperature coefficient of the resistivity and crystallization are studied in Fe/sub 100-x/B/sub x/, Fe/sub 80-x/Co/sub x/B/sub 20/, Fe/sub 78/B/sub 22-x/Si/sub x/ and Fe/sub 100-x/B/sub x-y/Si/sub y/ amorphous alloys. From the comparison of the theory with experimental data, the structure factors for these alloys were evaluated. The sharp drop of the resistivity at crystallization temperature increases with Fe content and decreases with Si content. During the measurements the Debye temperature could vary for a given sample. This variation is considered to be produced by changes in microstructure of the amorphous sample which are induced by thermal activation during thermal treatments. An irreversible change of the short-range order is attained which is related to an irreversible decrease of the free volume. Simultaneously, a reversible modification of this order is interpreted as due to reorientation of atomic chemical bonds.<
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