• Title/Summary/Keyword: Sr-ferrite sintered magnet

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Magnetic Properties of Mn and La-Mn Substituted Strontium Ferrite (Mn 및 La-Mn 치환 Sr 페라이트의 자기적 특성 변화)

  • 장세동;김종오;김종희
    • Journal of the Korean Magnetics Society
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    • v.11 no.6
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    • pp.267-271
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    • 2001
  • These experiments were carried out to examine the effects of elemental substitution of Mn and La-Mn on Sr-ferrite. The calcined properties for the Mn and La-Mn substitution were examined, and the sintered magnetic properties were compared with the stoichiometric condition. The magnetic properties of calcined SrM and (La-Mn)$_{0.3}$-SrM composition were as follows, respectively; M$_{s}$ : 61.06 emu/g, $_{i}$H$_{c}$ : 4.45 kOe and M$_{s}$ : 61.06 emu/g, $_{i}$H$_{c}$ : 4.46 kOe. Also, the sintered ferrite magnets of Mn$_{0.3}$-SrM and [(La-Mn)$_{0.3}$-SrM exhibited a similar properties to the stoichiometric composition but the coercivity of (La-Mn)$_{x}$-SrM was decreased rapidly with x=0.5.

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Magnetic properties of Sr-ferrite by La-Co substitution (La-Co 치환량에 따른 스트론튬 페라이트의 자기특성)

  • 장세동
    • Resources Recycling
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    • v.11 no.5
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    • pp.16-20
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    • 2002
  • This experiment was carried out to examine the effects of La-Co substitution on Sr-ferrite. The magnetic properties of calcined and sintered materials varied with the substitutional amount of La and Co elements in Sr-ferrite. Anisotropy field and coercivity for Sr ferrite were increased with raising La-Co substitution amounts. The microstructure observation for Sr ferrite substituted by La-Co revealed that La-Co inhabited grain growth during calcination and promoted lateral grain growth during sintering. The relationship between $B_{r}$ and $_{i}$ /$H_{c}$ for La-Co substituted Sr-ferrite was found to be $B_{r}$$≒0.097_{i}$ /$H_{c}$/+4500. In case of $SrFe_{12}$ $O_{19}$, $B_{r} was 4090 G and $_{ i}$$H_{c}$ was 3560 Oe, but $B_{r}$ was 4080 G and and $_{i}$ $H_{c}$ was 4800 Oe for $Sr_{0.7}$ $La_{0.3}$ $Fe_{11.7}$ /$Co_{0.3}$ $O_{19}$.

Effects of ${Co_3}{O_4}$, and ${La_2}{O_3}$on the Magnetic Properties of Sr-Ferrite (${Co_3}{O_4}$${La_2}{O_3}$ 첨가가 Sr 페라이트의 자기적 특성에 미치는 영향)

  • Jang, Se-Dong;Kim, Chong-O;Kim, Jong-Hui
    • Korean Journal of Materials Research
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    • v.11 no.8
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    • pp.685-689
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    • 2001
  • We carried out these experiments to examine the effects of element substitution of Co and La-Co for Sr-ferrite. The calcined properties of Co and La-Co element substitution were examined, and also the sintered magnetic properties were measured with the stoichiometric condition. The magnetic properties of $(La-Co)_{0.3}-SrM$ composition are as follows; $(M_s)$: 71.08 emu/g, $iH_c$: 4.38 kOe and $B_r$ : 4.18 kG, $iH_ c$ :4.35 kOe, $BH_{max}$: 4.3 MGOe. The $BH_{max}$ value was increased up to 10 % compared with conventional values. Our results imply that the magnetic properties of Sr-ferrite can be improved by the substitution of those elements.

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