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논문 기본 정보

자료유형
학술저널
저자정보
Kwang Pyo Chae (Konkuk University) Won-Ok Choi (Konkuk University) Byung-Sub Kang (Konkuk University) Young Bae Lee (Hanzhong University)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.20 No.1
발행연도
2015.3
수록면
26 - 30 (5page)

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초록· 키워드

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The crystallographic and magnetic properties of gallium-substituted cobalt ferrite (CoGa<SUB>x</SUB>Fe<SUB>2-x</SUB>O₄) were investigated. The new material was synthesized using conventional ceramic methods, with gallium substituted for ferrite in the range of x = 0.0 to 1.0, in steps of 0.2. X-ray diffraction and Mossbauer spectroscopy were used to confirm the presence of crystallized particles in the CoGa<SUB>x</SUB>Fe<SUB>2-x</SUB>O₄ ferrite powders. All of the samples exhibited a single phase with a spinel structure, and the lattice parameters decreased as the gallium content increased. The particle size of the samples also decreased as gallium increased. For x ≤ 0.4, the Mossbauer spectra of CoGa<SUB>x</SUB>Fe<SUB>2-x</SUB>O₄ could be fitted with two Zeeman sextets, which are the typical spinel ferrite spectra of Fe<SUP>3+</SUP> with A- and B-sites. However, for x ≥ 0.6, the Mossbauer spectra could be fitted with two Zeeman sextets and one doublet. The variation in the Mossbauer parameters and the absorption area ratio indicated a cation distribution of (Co<SUB>0.2-0.2x</SUB>Ga<SUB>x</SUB>Fe<SUB>0.8-0.6x</SUB>)[Co<SUB>0.8+0.2x</SUB>Fe<SUB>1.2-0.4x</SUB>]O₄, and the magnetic behavior of the samples suggested that the increase in gallium content led to a decrease in the saturation magnetization and in the coercivity.

목차

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

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