Mössbauer spectroscopy studies of the annealing of amorphous Fe74B26shows that the width of the magnetic hyperfine field distribution decreases for annealing temperatures below 600 K. This is ascribed to structural relaxation of the amorphous phase. Annealing at higher temperatures leads to crystallization into α-Fe and Fe2B with the intensity of the latter component decreasing with increasing annealing temperature. At 778 K only about 4 at% of boron is left in iron-containing phases. Most probably borates form at the expence of Fe2B. © 1992.
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