Fe0.8Rh0.2 nanoparticles with an average size of 1.8 nm have been synthesized by simultaneous decomposition of stoichiometric quantities of Fe[N(Si(CH3)3)2]2 and Rh(C3H5)3 in mild conditions of temperature and hydrogen pressure, using hexadecylamine as stabilizer. These nanoparticles display a magnetization of 1.13 μB per iron atom, which is more than two times smaller than the bulk value with the same composition. No surface contamination with iron oxides was detected by Mössbauer spectroscopy. Superconducting quantum interference device and Mössbauer spectroscopy investigations reveal that the origin of this variation may be a core-shell Rh/Fe chemical arrangement.
Bibliographical noteFunding Information:
This work was supported by the European Community Marie Curie Research Training Network — Syntorbmag — MRTN-CT-2004-005567. The authors thank Alain Mari and J.-F. Meunier for recording magnetic and Mössbauer measurements respectively, and Vincent Colliere for technical assistance in TEM imaging.
- Core-shell segregation
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Condensed Matter Physics