Distributions of hyperfine parameters in nanocrystalline Fe78Al4Nb5B12Cu1 alloys

Magnetic properties of nanocrystalline Fe78Al4Nb5B12Cu1 alloy were investig ated by Mossbauer spectroscopy. As-quenched amorphous ribbon was flash anne aled at temperature range of between 350 and 700 degreesC to obtain differe nt stages of crystallization. Mossbauer spectra consist of both sharp sexte t due to BCC-Fe(Al) phase and two binomially distributed sextets due to amo rphous matrix and interface layer, respectively. Distribution of various hy perfine parameters were obtained and special focus was given to the structu re of interfacial layer. The flash anneal starts the crystallization at 400 degreesC, and shows Fe2B phase at 550 degreesC. The fraction of crystallin e phase produced by annealing was as high as 46% at 550 degreesC. (C) 2001 Elsevier Science B.V. All rights reserved.