化学的共沈法によるCo-Ni(-Li)スピネル微粒子作製における製造条件の検討並びにCo-Ni-Li系スピネル微粒子の諸特性(ハード磁性材料)

概要

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An experiment was carried out to investigate the manufacturing condition for chemical coprecipitation method, and the effect of Li_2O_3 substitution on the magnetic and physical properties of Co-Ni spinel ferrite fine particles. As one of the examinations, the alkaline aqueous solution inflowed into the metal mixture solution on a constant speed. As a result, this method yielded fine particles with more stable properties than the pH control method (the conventional method). As regards the (CoO)_<0.5>(NiO)_<0.5-x>(Li_2O_3)_<0.5x>・Fe_2O_3 (x=0-0.5) composition, the new method showed good properties in (CoO)_<0.5>(NiO)_<0.3>(Li_2O_3)_<0.1>・Fe_2O_3 composition, with magnetic properties of σ_s=64.3×10^<-6> Wb・m/kg (51.2 emu/g), H_<cJ>=406.0 kA/m (5.12 kOe). K_1=10.0×10^4 J/m^3, K_2=-39.6×10^4 J/m^3. The average particles size was about 34 nm. The rotational hysteresis integral (Rh), which was related to the magnetization mechanism of these fine particles was 1.66, and it was found that the magnetization mechanism was an incoherent rotation one.
社団法人日本磁気学会の論文
2006-03-01