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<p>We proposed a material composition based on Fe<sub>81-<i>x</i></sub>Nb<sub><i>x</i></sub>B<sub>2</sub>Co<sub>2</sub>Cr<sub>5</sub>Zr<sub>10</sub> alloys to effectively balance the cooling efficiency and cost of consumption in magnetic refrigerators. Fe<sub>81-<i>x</i></sub>Nb<sub><i>x</i></sub>B<sub>2</sub>Co<sub>2</sub>Cr<sub>5</sub>Zr<sub>10</sub> alloy ribbons were prepared by using a melt-spinning method and their magnetocaloric effect (MCE) was investigated through the measurements of magnetization. The Curie temperature (<i>T</i><sub>C</sub>) was successfully adjusted from 320&#xa0;K (<i>x</i> = 0) to room temperature (298&#xa0;K) with an Nb substitution (<i>x</i> = 2) to Fe. Besides a small hysteresis loss (coercive field about 0.005&#xa0;T), its maximum magnetic entropy change (|Δ<i>S</i><sub>m</sub>|<sub>max</sub>) was 1.0&#xa0;J·kg<sup>−1</sup>·K<sup>−1</sup> at 298&#xa0;K under a magnetic field gradient (µ<sub>0</sub>Δ<i>H</i>) of 1.2&#xa0;T and deduced to be 2.8&#xa0;J·kg<sup>−1</sup>·K<sup>−1</sup> with a µ<sub>0</sub>Δ<i>H</i> = 1.2&#xa0;T. Moreover, this composition alloy exhibits a considerable refrigerant capacity (96.9&#xa0;J·kg<sup>−1</sup>) for µ<sub>0</sub>Δ<i>H</i> = 1.2&#xa0;T. The trade-off between the lowering <i>T</i><sub>C</sub> to room temperature, small hysteresis loss, and decline of |Δ<i>S</i><sub>m</sub>|<sub>max</sub> can be attributed to the micro-alloyed composition with Nb. Due to these criteria characteristics for MCE materials, the Fe<sub>79</sub>Nb<sub>2</sub>B<sub>2</sub>Co<sub>2</sub>Cr<sub>5</sub>Zr<sub>10</sub> composition alloy can be a potential material for magnetic refrigerant at room temperature.</p>

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Development of a material composition for effective room temperature magnetocaloric effect based on Fe-B-Zr precursor amorphous alloy

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Nguyen Hai Yen,
  • Nguyen Huy Ngoc,
  • Kieu Xuan Hau,
  • Truong Viet Anh,
  • Pham Thi Thanh,
  • Nguyen Huy Dan

摘要

We proposed a material composition based on Fe81-xNbxB2Co2Cr5Zr10 alloys to effectively balance the cooling efficiency and cost of consumption in magnetic refrigerators. Fe81-xNbxB2Co2Cr5Zr10 alloy ribbons were prepared by using a melt-spinning method and their magnetocaloric effect (MCE) was investigated through the measurements of magnetization. The Curie temperature (TC) was successfully adjusted from 320 K (x = 0) to room temperature (298 K) with an Nb substitution (x = 2) to Fe. Besides a small hysteresis loss (coercive field about 0.005 T), its maximum magnetic entropy change (|ΔSm|max) was 1.0 J·kg−1·K−1 at 298 K under a magnetic field gradient (µ0ΔH) of 1.2 T and deduced to be 2.8 J·kg−1·K−1 with a µ0ΔH = 1.2 T. Moreover, this composition alloy exhibits a considerable refrigerant capacity (96.9 J·kg−1) for µ0ΔH = 1.2 T. The trade-off between the lowering TC to room temperature, small hysteresis loss, and decline of |ΔSm|max can be attributed to the micro-alloyed composition with Nb. Due to these criteria characteristics for MCE materials, the Fe79Nb2B2Co2Cr5Zr10 composition alloy can be a potential material for magnetic refrigerant at room temperature.