Abstract：L10 structured (FePt)1-x Cux nanoparticles (NPs) were directly prepared by polyol method at 340 ℃. The effects of copper additive on the morphology, structure and chemical ordering of as-prepared FePt NPs were investigated. X ray diffraction results showed that without Cu doping the as-prepared NPs possessed fcc structure and gradually showed typical fct diffraction peaks after increasing the Cu doping concentration. Meanwhile the metallic Cu phase is observed. TEM images exhibited that as-prepared NPs had bigger particles size and wider particle size distribution after introducing Cu additive. Magnetic properties measurement showed that a coercivity of 1300 Oe was obtained when the molar ratio of Cu reached 25. 9% in the (FePt)1-xCux nanoparticles. This study indicated Cu doping has a certain in promoting the phase-transition of FePt nanoparticles.
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2014, Vol. 21 
