X-ray absorption analysis of core/shell magnetic (Fe, Co)–B nanoparticles of amorphous and crystalline structure obtained by chemical reduction |
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| Institution: | 1. Depto. CITIMAC, Universidad de Cantabria, Santander 39005, Spain;2. School of Physics, University of Hyderabad, Hyderabad 500 046, India;3. Depto. Elec. y Electrónica, Univ. País Vasco, Bilbao 48080, Spain;4. SRS-Daresbury, Warrington, Cheshire, WA4 4AD, UK;5. Department of Physics and Astronomy, UCL and London Centre for Nanotechnology, London WC1E 6BT, UK |
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| Abstract: | Core/shell nanoparticles of M–B (M = Fe, Co) with amorphous and mixed amorphous + bcc-Fe core have been synthesized by chemical reduction of metallic salts by sodium borohydride. The XANES spectra show the existence of a surface layer consisting of metallic hydroxides in a percentage around 15 at.%. The EXAFS reveals the existence of short-range order in the amorphous core with a contribution from the M–O pairs of the shell and a variation of the coordination numbers with respect to bulk alloys. The existence of Fe-bcc in the mixed alloys is observed in the Fourier transform of the EXAFS data. |
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