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Synthesis of Magnetic Nanoparticles (Fe and FePt) by Plasma-Induced Cathodic Discharge Electrolysis

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5 Author(s)
Manabu Tokushige ; Dept. of Appl. Chem., Doshisha Univ., Kyoto ; Takashi Yamanaka ; Akira Matsuura ; Tokujiro Nishikiori
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Magnetic nanoparticles of Fe and FePt intermetallic compound were synthesized in molten LiCl-KCl-CsCl electrolyte under 1 atm of Ar atmosphere using plasma-induced cathodic discharge electrolysis. First, a synthesis of fine and uniform Fe nanoparticles was successfully conducted at various Fe(II) ion concentrations. Fe nanoparticles less than 50 nm with a narrow distribution width were obtained at low Fe(II) ion concentration such as 0.1 mol%. When the flowed electricity was increased threefold while the concentration remained at 0.1 mol%, the obtained particle size increased to around 100 nm. Using the Fe nanoparticles obtained by the aforementioned method, FePt intermetallic compound nanoparticles with diameters around 100 nm were obtained by a displacement reaction between the dispersed Fe nanoparticles and dissolved Pt(II) ion in the melt, followed by a solid-phase interdiffusion of Pt and Fe.

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IEEE Transactions on Plasma Science  (Volume:37 ,  Issue: 7 )