Abstract
The effects of Ta substitution on the first-order phase transition have been firstly studied in Hf1-xTaxFe2 (x = 0.15, 0.165, 0.18) alloys with kagome-type lattice. Higher Ta substitution leads to the reduced metamagnetic transition temperature (Tt) from low-temperature ferromagnetism to high-temperature antiferromagnetism and paramagnetism. By doping C atoms, the Tt is gradually reduced and thermal hysteresis becomes widened in the alloys with higher Ta substitution. The critical field which triggers the metamagnetic phase transition is not substantially affected by interstitial C atoms. With increased Ta substitution, for the field change of 7 T, the maximum of magnetic entropy change (ΔSmax) of 3.7 J kg−1 K−1 is obtained at x = 0.15 and enhanced to 4 J kg−1 K−1 at x = 0.165 but reduced to ~ 3.21 J kg−1 K−1 in Hf0.82Ta0.18Fe2 alloy. By C addition, both Tt and the temperature where ΔS is maximized are shifted to a lower temperature, especially in the higher Ta-contained alloys.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 61901440 and 51971056), Beijing Municipal Natural Science Foundation (Grant No. 4202080), Fundamental Research Funds for the Central Universities (Grant No. N2009001, No.2009002, and No. N2002005), State Key Lab of Advanced Metals and Materials (Grant No.2019-ZD07), joint funding between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals (Grant No. 18LHPY014), and Liaoning Revitalization Talent Program (Grant No. XLYC1907175).
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Li, S., Wu, H., Zhao, N. et al. Interstitial Effects on the Magnetic Phase Transition and Magnetocaloric Effects in (Hf, Ta)Fe2 Kagome Phase. J Supercond Nov Magn 33, 3211–3215 (2020). https://doi.org/10.1007/s10948-020-05578-z
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DOI: https://doi.org/10.1007/s10948-020-05578-z