Magnetocaloric effect and critical behavior in Fe-La-Zr rapidly quenched ribbons

Fe90-xLaxZr10 (x = 1 and 2) rapidly quenched ribbons with thickness of about 15 μm were prepared by the melt-spinning method. X-ray diffraction analysis shows that the structure of the ribbons is mostly amorphous. The Curie temperature, TC, of the alloy considerably increased, from ∼262 K for x = 1...

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Published in:Journal of science. Advanced materials and devices 2018-12, Vol.3 (4), p.406-411
Main Authors: Hau, Kieu Xuan, Ha, Nguyen Hoang, Le Thi, Nguyen, Yen, Nguyen Hai, Thanh, Pham Thi, Huyen Yen, Pham Duc, Ngoc, Nguyen Huy, Thanh, Tran Dang, Koledov, Victor V., Kim, Dong Hyun, Yu, Seong-Cho, Dan, Nguyen Huy
Format: Article
Language:English
Subjects:
Critical parameter
Magnetic entropy change
Magnetic refrigerant
Magnetocaloric effect
Melt-spinning method
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Summary:Fe90-xLaxZr10 (x = 1 and 2) rapidly quenched ribbons with thickness of about 15 μm were prepared by the melt-spinning method. X-ray diffraction analysis shows that the structure of the ribbons is mostly amorphous. The Curie temperature, TC, of the alloy considerably increased, from ∼262 K for x = 1 to ∼302 K for x = 2, with increasing La-concentration. The maximum magnetic entropy change, |ΔSm|max, of the alloy is about 1.1 J∙kg−1K−1 for a magnetic field change ΔH = 12 kOe. A quite large refrigerant capacity (RC ∼ 74 J∙kg−1 for ΔH = 12 kOe) near the room temperature region is obtained for the alloy. A thorough analysis on critical exponents around the ferromagnetic-paramagnetic phase transition, using the Arrott–Noakes plots and Kouvel–Fisher method, sheds light on the critical magnetic behavior and its association with the magnetocaloric effect in the Fe-La based alloys.
ISSN:2468-2179
2468-2179
DOI:10.1016/j.jsamd.2018.11.002