小粒径針状α-FeOOHから作製した配向性Mn-Znフェライトの磁気特性

抄録

Acicular manganese zinc ferrite fine particles were made from small acicular α-FeOOH, Mn(C₅H₇O₂)₃, and Zn(C₅H₇O₂)₂. The long axis of these fine particles was oriented in parallel to the external magnetic field of 557kA/m, and then formed into multi-layered toroidal core. The green compact was sintered at 1200°C for 6 hours in air, and then cooled in a nitrogen atmosphere. The relative bulk density of the sintering body was improved from 87.0% to 90.2%. Crystallites consisted of the {110} plane were aligned along the upper plane of toroidal core of crystal-oriented manganese zinc ferrite. The initial permeability of crystal-oriented manganese zinc ferrite was 2240 at 0.1 MHz. The sample exhibited excellent high frequency magnetic properties.