ディップコーティング法によるマグネトプランバイト型フェライト薄膜の作製と磁気的性質

概要

論文の詳細を見る
Thins film of magnetoplumbite type ferrite (MFe_<12>O_<19>, M=Ba, Sr) have been prepared by the dip-coating method from sol-gel process. Ferric nitrates, other metal nitrate and titaniumoxiacetylacetonate were used as law materials, and glycerol was used as solvent. A film was prepared by dipping a silica glass plate. The magnetoplumbite type ferrite was obtained by heat-treatment at 750℃ for 5h in air. The film thickness was about 0.08 μm. The coercive forces (H_c) of the film and powder with the composition of 15BaO・85Fe_2O_3 was 3300 and 3050 Oe by heat-treatment at 850℃ for 48h respectively. These films were shown to have much larger H. than the powder. The effect of substitution of titanium and cobalt ion in barium hexaferrite films and powders were investigated. The saturation magnetization of the powder in the system 15 BaO・85 [(100 -2 x) Fe_2O_3・xTiO_2・xCoO]was almost constant in the range of 0≦x≦8.33. But the H_c changed drastically with increasing titanium and cobalt ion content. The H_c of the powder was controllable in the range of 50 Oe and 3050 Oe by changing the substitution contents for the same system. The H. of the films was controllable in the range of 300 Oe and 3300 Oe for the same system.
社団法人日本セラミックス協会の論文
1989-09-01