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Z-Type 바리움 페라이트 분말의 연자성 특성에 미치는 Ba 및 Fe 농도의 영향
조광묵(Kwang Muk Cho),남인탁(In Tak Nam) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.1
Z-type barium ferrite [(Ba<SUB>3</SUB>Co<SUB>0.8</SUB>Zn<SUB>1.2</SUB>Fe<SUB>24</SUB>O<SUB>41</SUB>, Ba<SUB>3 + δ</SUB>Co<SUB>0.8</SUB>Zn<SUB>1.2</SUB>Fe<SUB>24</SUB>O<SUB>41</SUB> δ = 3, 5, 7, 13 wt%. Ba<SUB>3</SUB>Co<SUB>0.8</SUB>Zn<SUB>1.2</SUB>Fe<SUB>24 + δ</SUB>O<SUB>41</SUB> δ = 5, 7, 10 wt% )] were synthesized using co-precipitation method. The microstructure and magnetic properties of synthesized particles were investigated. In all prepared particles M-type Ba ferrite is identified with Z-type Ba ferrite together. It is found that particles having 7 wt% for Ba and 5 wt% for Fe excess addition revealed high saturation magnetization, respectively. All synthesized particles showed relatively high coercivity for device application. This result may be attributed to the contribution of M-type Ba ferrite. Ba and Fe excess addition was not affected to the structural change of CoZnZ Ba ferrite. The certain amount of excess additions of Ba and Fe and the 2 step heat-treatment may be beneficial to the improvement of soft magnetic properties of Z-type barium hexa-ferrite.
고상반응법으로 제조된 Ba₂Co₂Fe₁₂O₂₂ 분말의 자기적 성질과 미세구조에 미치는 금속이온몰비와 열처리 온도의 영향
조광묵(Kwang Muk Cho),남인탁(In Tak Nam) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.6
Y-type barium ferrite Ba₂Co₂Fe₁₂O₂₂ was synthesized by a solid state reaction method. Effects of metal ion mole ratio and calcination temperatures on magnetic properties and microstructures of the synthesized powders were investigated. Phase analysis and microstructure observation were performed with a XRD (X-ray diffractometer) and a FESEM (field effect scanning electron microscope), respectively. Magnetic properties of the powders were measured with a VSM (vibrating sample magnetometer). Single phase Y-type was synthesized when metal ion mole fraction Fe³?: Ba²?: Co²? was 6 : 1 : 1 and calcination temperature was 1050 ℃. High saturation magnetization value of 39.1 emu/g was obtained when metal ion mole fraction Fe³?: Ba²?: Co²? was 8 : 1 : 1 and calcination temperature was 1200 ℃.