Sanyal, Udishnu and Ener, Semih and Anagnostopoulou, Evangelia and Pousthomis, Marc and Fazzini, Pier-Francesco and Lacroix, Lise-Marie and Skokov, Konstantin P. and Gutfleisch, Oliver and Viau, Guillaume (2016):
Co@CoSb Core–Shell Nanorods: From Chemical Coating at the Nanoscale to Macroscopic Consolidation.
In: Chemistry of Materials, 28 (14), pp. 4982-4990. American Chemical Society, Washington, USA, ISSN 0897-4756,
[Article]

Abstract

Core-shell magnetic anisotropic particles were prepared by reduction of Sb acetate at the surface of cobalt nanorods dispersed in a solution consisting of 1,2 tetradecanediol in oleylamine. X-ray diffraction and local EDS analyses revealed a thin beta-CoSb shell with a controlled thickness ranging from 5 to 15 nm that depended on the Sb/Co molar ratio and the reduction temperature. The shell completely coats the rod surface but does not alter the shape anisotropy or the hcp structure of the cobalt cores, and the hard magnetic properties are preserved after coating with a coercivity higher than 3 kOe. Consolidated nanostructured materials that exhibit properties of permanent magnets were prepared by compaction of the core-shell Co@CoSb nanorods. The thin CoSb shell was very efficient for preventing the cobalt anisotropic core from sintering at high temperatures (up to 300 degrees C) and high pressures (up to 1.5 GPa). These results indicate that the bottom-up approach is very promising for preparation of nanostructured hard magnetic materials.

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