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논문 기본 정보

자료유형
학술저널
저자정보
Ersin Civan (National Defence University) Kagan Sarlar (Uludag University) Ilker Kucuk (Uludag University)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.24 No.1
발행연도
2019.3
수록면
43 - 48 (6page)
DOI
10.4283/JMAG.2019.24.1.043

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초록· 키워드

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The effects of adding Gd on the Curie temperature (TC), glass-forming ability (GFA), and magnetocaloric effect (MCE) were studied in Fe<SUB>68-x</SUB>Gd<SUB>x</SUB>Tb₅B<SUB>23</SUB>Nb₄ (x = 0, 2, and 6) glassy alloys prepared by suction casting. It was shown that when Gd content was exchanged with Fe partially for x = 2, GFA was increased, whereas for x = 6, adding Gd content has reduced the GFA and amorphous structure could not be obtained. Critical diameter was found to be 3 ㎜ for Fe<SUB>66</SUB>Gd₂Tb₅B<SUB>23</SUB>Nb₄ bulk metallic glass (BMG). By exchanging Gd with Fe partially, TC could effectively be tuned in a quite broad temperature interval from 487 K (x = 0) to 380 K (x = 6) for which amorphous structure could not be obtained. Maximum magnetic entropy change (−ΔS<SUB>M</SUB>)<SUP>max</SUP> values were found to be 1.16, 0.84 Jkg<SUP>−1</SUP>K<SUP>−1</SUP>, and 0.54 J㎏<SUP>−1</SUP>K<SUP>−1</SUP> as well as, refrigeration capacity (RC) values were obtained as 116 J/㎏, 84.84 J/㎏, and 40.50 J/㎏ under a low field change of 2 T for x = 0, 2, and 6, respectively. Although T<SUB>C</SUB> was shifted to lower temperatures by exchanging Fe with Gd partially, −(ΔS<SUB>M</SUB>)<SUP>max</SUP> decreased almost half of the base alloy and RC decreased approximately 1/3 of the base alloy.

목차

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

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