The Study on Microstructure and Magnetic Properties of Ferrite with Various Fe Contents in $Mg_{1.9-2x}Mn_{0.05}Fe_{4x}O_{4+${\gamma}$}+2_{wt%} Al_2O_3$

$Mg_{1.9-2x}Mn_{0.05}Fe_{4x}O_{4+${\gamma}$}+2_{wt%} Al_2O_3$ 조성내 Fe량 변화에 따른 페라이트의 미세구조 및 자기적 특성 연구

  • 김성재 ;
  • 정명득 ;
  • 강대석
  • Published : 1994.03.01

Abstract

The electric and magnetic properties of Mg1.9-2xMn0.05Fe4xO4+${\gamma}$+2wt% Al2O3, and its microstructure have been investigated as a function of ferrite composition (x=0.45, 0.5, 0.55). The microstructure turned out to be independent on the ferrite composition. The resistivity was decreased with increasing Fe contents, whereas the Curie temperature decreased. Saturation magnetization was varied from 1741 to 2022 G with composition, and squareness ratio (SR), coercive force (BHc) were decreased and increased with increasing Fe contents respectively, so the sample which SR and BHc were 0.97 Oe and 1.49 Oe can be attainable at x=0.45.

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References

  1. to be published elsewhere S.J. Kim et al.
  2. 요업재료의 과학과 기술 v.3 no.2 Redox 이온을 함유한 유리내 redox비의 이동과 전기전도성 이정훈
  3. J. Phys. Soc. v.15 Muramori.K;S.Miyahara
  4. J. Appl. Phys v.25 E. Arbers-Schoenberg, E.
  5. J. Am. Ceramic. Soc. v.70 no.6 Iron-Excess Manganese Ferrite:Electrical conductivity and Cation Distribution H.I. You et al
  6. Czech. J Phys v.10 Broz, J.