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논문 기본 정보

자료유형
학술저널
저자정보
Woo Hyun Kwon (건국대학교) Jeoung Yun Kang (건국대학교) Jae-Gwang Lee (건국대학교) Seung Wha Lee (건국대학교) Kwang Pyo Chae (건국대학교)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.15 No.4
발행연도
2010.12
수록면
159 - 164 (6page)

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The Zn, Co and Ni substituted manganese ferrite powders, Mn1-x(Zn, Co, Ni)<SUB>x</SUB>Fe₂O₄, were fabricated by the solgel method, and their crystallographic and magnetic properties were studied. The Zn substituted manganese ferrite, Zn<SUB>0.2</SUB>Mn<SUB>0.8</SUB>Fe₂O₄, had a single spinel structure above 400 ℃, and the size of the particles of the ferrite powder increased when the annealing temperature was increased. Above 500 ℃, all the Mn<SUB>1-x</SUB>(Zn, Co, Ni)<SUB>x</SUB>Fe₂O₄ ferrite had a single spinel structure and the lattice constants decreased with an increasing substitution of Zn, Co, and Ni in Mn<SUB>1-x</SUB>(Zn, Co, Ni)<SUB>x</SUB>Fe₂O₄. The Mossbauer spectra of Mn<SUB>1-x</SUB>Zn<SUB>x</SUB>Fe₂O₄ (0.0≤x≤0.4) could be fitted as the superposition of two Zeeman sextets due to the tetrahedral and octahedral sites of the Fe<SUP>3+</SUP> ions. For x = 0.6 and 0.8 they showed two Zeeman sextets and a single quadrupole doublet, which indicated they were ferrimagnetic and paramagnetic. And for x = 1.0 spectrum showed a doublet due to a paramagnetic phase. For the Co and Ni substituted manganese ferrite powders, all the Mossbauer spectra could be fitted as the superposition of two Zeeman sextets due to the tetrahedral and octahedral sites of the Fe<SUP>3+</SUP> ions. The variation of the Mossbauer parameters are also discussed with substituted Zn, Co and Ni ions. The increment of the saturation magnetization up to x = 0.6 in Mn<SUB>1-x</SUB>Co<SUB>x</SUB>Fe₂O₄ could be qualitatively explained using the site distribution and the spin magnetic moment of substituted ions. The saturation magnetization and coercivity of the Mn<SUB>1-x</SUB>(Zn, Co, Ni)<SUB>x</SUB>Fe₂O₄ (x = 0.4) ferrite powders were also compared with pure MnFe₂O₄.

목차

1. Introduction
2. Experiment
3. Results and Discussion
4. Conclusion
Acknowledgements
References

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