化学的共沈法によるCo-Ni-Mnスピネル系微粒子の作製条件による諸特性

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An experiment was carried out to investigate the effect of MnO substitution, mole ratio n {=Fe^<3+>/(Co^<2+>+Ni^<2+>+Mn^<2+>)}, reaction temperature, and concentration of alkali on the magnetic and physical properties of Co-Ni-Mn ferrite prepared by the chemical coprecipitation method without post-annealing. The chemical coprecipitation compositions were chosen according to the formula (CoO)_<0.5>(NiO)_<0.5-x>(MnO)_x ・ n/2(Fe_2O_3), where x varied between 0 and 0.5 and n varied between 1.80 and 2.00. To remove the superparamagnetic substance, the coprecipitation fine particles were etched with dilute sulfuric acid. As a result, in the (CoO)_<0.5>(NiO)_<0.3>(MnO)_<0.2> ・ 1.95/2(Fe_2O_3) composition, when the reaction temperature and excess NaOH were 60℃ and 0.5 mol, the following magnetic and physical properties were obtained: saturation magnetization os=79.77×1O^<-6> Wb・m/kg, residual magnetization or=47.38×1O^<-6> Wb・m/kg, coercivity H_<cj>=184 kA/m, and average particle size D=19.61 nm.
社団法人日本磁気学会の論文
2007-07-01