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- 저자 : 백인승(In Seung Baek) (검색결과 3 건)
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공침법으로 합성한 바륨 페라이트(BaM)의 형성과 자기적 성질에 미치는 금속이온 몰 비 및 pH와 열처리 조건의 영향
백인승(In Seung Baek),남인탁(In Tak Nam) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.6
M-type barium ferrite (BaFe₁₂O₁?) powders were synthesized through the co-precipitation method. Starting material composition Fe³?: Ba²? mole ratio was fixed as 8 and the relative amount of Fe³? and Ba²? was controlled. Structure and magnetic properties and powder morphology were investigated using XRD, SEM, VSM. Powder showing high coercivity and small magnetization was obtained at pH8 and Fe³?: Ba²? of 12 : 1.5. Small magnetization value was originated from the existence of α-Fe2O3. Single-phase Mtype barium ferrite were obtained regardless of the heat treatment condition and the amount of Fe³? and Ba²? at pH?10. The largest value of magnetization (55.7 emu/g) under investigation were obtained when Fe³?: Ba²? of 13.6 : 1.7 and furnace cooled powder in O₂. Particle size of powder was in the range of 50~200 ㎚.
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공침법으로 합성한 바륨 페라이트(BaM) 분말의 결정구조와 자기적 성질
백인승(In Seung Baek),남인탁(In Tak Nam) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.4
Barium ferrite (BaFe<SUB>12</SUB>O<SUB>19</SUB>) powders were synthesized by the co-precipitation method. Fe<SUP>3+</SUP>: Ba<SUP>2+</SUP> mole ratio was fixed 8 and relative amount of Fe<SUP>3+</SUP> and Ba<SUP>2+</SUP> was controlled. The effects of the pH (= 8, 9, 10), calcination temperature and time on the morphology, structure and magnetic properties of the barium ferrite particles are characterized using XRD, FESEM, and VSM respectively. Coercivity and magnetization value of powders were changed with calcination temperature and time, relative amount of Fe<SUP>3+</SUP> and Ba<SUP>2+</SUP> and pH. Single-phase barium ferrite was obtained when pH value was 9 in the investigated range of Fe<SUP>3+</SUP>: Ba<SUP>2+</SUP> relative amount and secondary phases were appeared at Fe<SUP>3+</SUP>: Ba<SUP>2+</SUP> relative amount of 14.4 : 1.8. The largest value of magnetization (65.7 emu/g) was obtained when Fe<SUP>3+</SUP>: Ba<SUP>2+</SUP> mole ratio was 12.8 : 1.6 and calcination temperature was 900 ℃ with air calcination atmosphere. The largest value of coercivity (5280 Oe) was obtained with O₂ calcination atmosphere.
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Co₂Z-type Barium Hexaferrite의 합성방법에 따른 결정구조 및 자기적 특성
백인승(In Seung Baek),남인탁(In Tak Nam) 한국자기학회 2014 韓國磁氣學會誌 Vol.24 No.1
Co₂Z-type barium ferrites (Ba₃Co₂Fe<SUB>24</SUB>O<SUB>41</SUB>) were synthesized using variation method. First, M-type, Co₂Y-type and Co₂Z-type synthesized by hydrothermal method. Second, M- and Y-type precursors for synthesis of Co₂Z hexaferrite by hydrothermal and ball milling method. the morphology, structure and magnetic properties of the barium ferrite particles were characterized using XRD, FESEM, VSM, impedance. As a result, Single phase of M-type and Co₂Y-type were obtained. Manufactured powders of M+Y ballmilling, M+Y hydrothermal were similar to single phase of Co₂Z-type hexaferrite, all powders were obtained theoretical magnetization (50 emu/g). The largest initial permeability were obtained Co₂Z hexaferrite synthesized by reagent precusor, With increasing calcination temperature was lowered the initial permeability. In another synthesis didnt almost that little change could be found.
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