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자료유형
학술저널
저자정보
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.13 No.3
발행연도
2008.9
수록면
110 - 113 (4page)

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In this study, heavy rare earth garnet Tb₂Bi₁Ga₁Fe₄O<SUB>12</SUB> powders were fabricated by a sol-gel and vacuum annealing process. The crystal structure was found to be single-phase garnet with a space group of Ia3d. The lattice constant a? was determined to be 12.465 A. From the analysis of the vibrating sample magnetometer (VSM) hysteresis loop at room temperature, the saturation magnetization and coercivity of the sample are 7.64 emu/g and 229 Oe, respectively. The Neel temperature (T<SUB>N</SUB>) was determined to be 525 K. The Mossbauer spectrum of Tb₂Bi₁Ga₁Fe₄O<SUB>12</SUB> at room temperature consists of 2 sets of 6 Lorentzians, which is the pattern of singlephase garnet. From the results of the Mossbauer spectrum at room temperature, the absorption area ratios of Fe ions on 24d and 16a sites are 74.7 % and 25.3 % (approximately 3:1), respectively. These results show that all of the non-magnetic Ga atoms occupy the 16a site by a vacuum annealing process. Absorption area ratios of Fe ions are dependent not only on a sintering condition but also on the temperature of the sample. It can then be interpreted that the Ga ion distribution is dependent on the temperature of the sample. The Mossbauer measurement was carried out in order to investigate the atomic migration in Tb₂Bi₁Ga₁Fe₄O<SUB>12</SUB>.

목차

1. Introduction
2. Experiment
3. Results and Disscussion
4. Summary
Acknowledgments
References

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