スピネル型ソフトフェライト(Ni_<1-2x>Ca_xMg_x)Fe_2O_4及び(Mn_<1-2x>Ca_xMg_x)Fe_2O_4の研究

概要

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New spinel-type ferrites (Ni_<1-2x>Ca_xMg_x)Fe_2O_4 and (Mn_<1-2x>Ca_x Mg_x)Fe2O_4 (0≤x≤ 0.5) were synthesized using a solid-state reaction. The crystalographic parameters were determined by XRD. The ionic distributions were estimated from XRD and from the low temperature magnetization to be (Fe^<3+>_<0.875> Mg^<2+>_<0.125>)[Ni^<2+>_<1-2x>Ca^<2+>_xMg^<2+>_<x-0.125>Fe^<3+>_<1.125>]O^<2->_4 (x≤0.125) and (Mn^<2+>_<0.375>-xFe^<3+>_<0.5+0.075x>Mg^<2+>_<0.125>) [Ca^<2+>_xMg^<2+>_<x-0.125>Mn^<3+>_<0.5-x>Fe^<2+>_<0.5-x>Fe^<3+>_<1.125>]O^<2->_4 for the Ni- and Mn-system, respectively. Electrical resistivity ρ was remarkably increased by the substitution χ. The maximum ρ at room temperature is 20 or 100 times of the non-substituted Ni-ferrite or Mn-ferrite, respectively
社団法人日本磁気学会の論文
2000-04-15