Abstract
Nanocolloids of the intermetallic β-CoAl phase were prepared by a soft organometallic route. They were fully characterized by (HR)TEM, EDX, WAXS, XAS and SQUID magnetometry. Their exposure to air led to an increased saturation magnetization in agreement with Co/Al segregation and the formation of Co/Al2O3 nanocomposite. Furthermore, the β-CoAl nanoparticles could be used as seeds to grow an aluminum overlayer, which passivated the alloyed core against oxidation. These nanoparticles yielded stable colloidal solutions in aromatic solvents.
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