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자료유형
학술저널
저자정보
Sung Yong An (aSSIST University)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.28 No.4
발행연도
2023.12
수록면
385 - 391 (7page)
DOI
10.4283/JMAG.2023.28.4.385

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초록· 키워드

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In this study, amorphous powders of Fe-Cu-Nb-Si-B composition were synthesized through gas and water atomization techniques utilizing industrial-grade raw materials. Subsequently, these powders underwent a sieving process to achieve a particle size classification under 53 ㎛, with an average particle size (D50) of 26 ㎛. The prepared powder underwent a series of heat treatments at temperatures of 450 ℃, 475 ℃, 500 ℃, 525 ℃, and 550 ℃ to investigate changes in its crystallographic structure, utilizing X-ray diffractometry (XRD). Simultaneously, magnetic properties were assessed through Mössbauer spectroscopy and vibrating sample magnetometry (VSM). The observed phase transformation progressed from amorphous to crystalline as the heat treatment temperature increased. An entirely amorphous phase was maintained up to 500 ℃, beyond which a mixed amorphous and crystalline phase emerged at higher temperatures. Mössbauer analysis revealed that, at 525 ℃, approximately 39 % of the material remained in an amorphous state, while 61 % had transitioned into a crystalline phase. Further, at 550 ℃, the amorphous fraction decreased to approximately 31 %, while the crystalline fraction increased to 69 %. The crystalline phase was identified as consisting of α-Fe, α-FeSi, Fe2Si, Fe₃Si at A-sites, Fe₃Si at B-sites, and Fe₂B sites in the case of the 550℃ heat treatment. With increasing heat treatment temperature, the saturation magnetization exhibited an initial increase, followed by a decline from 550 °C onward. This decline coincided with the decomposition of the material into multiple crystalline phases. Moreover, the Curie temperature was determined to be T<SUB>C</SUB>1=845 K and T<SUB>C</SUB>2=955 K, indicating two distinct magnetic transition temperatures in the studied material.

목차

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

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