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X-ray absorption analysis of core/shell magnetic (Fe,Co)B nanoparticles of amorphous and crystalline structure obtained by chemical reduction
DOI:
10.1016/j.jnoncrysol.2006.12.096
Authors:
L.
Fernandez Barquin
(Depto. CITIMAC, Universidad de Cantabria, Spain)
,
A.
Yedra
(Depto. CITIMAC, Universidad de Cantabria, Spain)
,
S. N.
Kaul
(School of Physics, University of Hyderabad, India)
,
M. L.
Fdez-gubieda
(Universidad País Vasco, Spain)
,
J. F. W.
Mosselmans
(Diamond Light Source)
,
Q. A.
Pankhurst
(UCL and London Centre for Nanotechnology, U.K.)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of Non-crystalline Solids
, VOL 353
, PAGES 733 - 737
State:
Published (Approved)
Published:
April 2007
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.
Journal Keywords: Nanoparticles
Subject Areas:
Chemistry,
Materials
Facility: SRS
Added On:
21/04/2010 07:54
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