• Title/Summary/Keyword: $Co_2Z$-type hexaferrite

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Structure and Magnetic Properties on Synthesis Route of Co2Z-type Barium Hexaferrite (Co2Z-type Barium Hexaferrite의 합성방법에 따른 결정구조 및 자기적 특성)

  • Baek, In Seung;Nam, In Tak
    • Journal of the Korean Magnetics Society
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    • v.24 no.1
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    • pp.1-10
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    • 2014

  • $Co_2Z$-type barium ferrites ($Ba_3Co_2Fe_{24}O_{41}$) were synthesized using variation method. First, M-type, $Co_2Y$-type and $Co_2Z$-type synthesized by hydrothermal method. Second, M- and Y-type precursors for synthesis of $Co_2Z$ 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 $Co_2Y$-type were obtained. Manufactured powders of M+Y ball milling, M+Y hydrothermal were similar to single phase of $Co_2Z$-type hexaferrite, all powders were obtained theoretical magnetization (50 emu/g). The largest initial permeability were obtained $Co_2Z$ hexaferrite synthesized by reagent precusor, With increasing calcination temperature was lowered the initial permeability. In another synthesis didn't almost that little change could be found.

  • https://doi.org/10.4283/JKMS.2014.24.1.001 인용 PDF KSCI

Crystal structure and microstructure of Z-type hexaferrite (Ba, La)Co2Fe24O41 by molten salt synthesis (용융염 합성법에 의한 Z형 육방정 페라이트 (Ba, La)Co2Fe24O41계의 결정구조와 미세구조)

  • Lee, Do Hyeok;Kwon, Chae-Yeon;Moon, Kyoung-Seok
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.31 no.5
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    • pp.197-202
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    • 2021

  • Synthesis of Z-type hexaferrite Ba3Co2Fe24O41 (Ba3Z) and Ba1.5La1.5Co2Fe24O41 (Ba1.5La1.5Z) powders were tried using molten salt synthesis after primary calcination. Ba3Z calcined at 1000℃ was formed with both M-type and Y-type hexaferrite, and then Z-type was obtained when sintered with molten salt at 1150℃ and 1200℃. In the case of Ba1.5La1.5Z calcined at 1000℃, however, M-type hexaferrite, CoFe2O4 (Spinel phase), and LaFeO3 were synthesized. As a result, Z-type hexaferrite was not synthesized after sintering with molten salt. In addition, the aspect ratio of the particles decreased as the sintering temperature increased with molten salt synthesis. To obtain a single-phase Ba1.5La1.5Z with a high aspect ratio, it is expected the raw materials have to calcine below the temperature of a spinel phase formation before sintering with molten salt.

  • https://doi.org/10.6111/JKCGCT.2021.31.5.197 인용 PDF KSCI HTML