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Phase transition and magnetocaloric properties of Mn 50 Ni 42− x Co x Sn 8 (0 ≤ x ≤ 10) melt-spun ribbons

Abstract : The characteristics of magnetostructural coupling play a crucial role in the magnetic field-driven behaviour of magnetofunctional alloys. The availability of magnetostructural coupling over a broad temperature range is of great significance for scientific and technological purposes. This work demonstrates that strong magnetostrucural coupling can be achieved over a wide temperature range (222 to 355 K) in Co-doped high Mn-content Mn50Ni42−xCoxSn8 (0 ≤ x ≤ 10) melt-spun ribbons. It is shown that, over a wide composition range with Co content from 3 to 9 at.%, the paramagnetic austenite first transforms into ferromagnetic austenite at TC on cooling, then the ferromagnetic austenite further transforms into a weakly magnetic martensite at TM. Such strong magnetostructural coupling enables the ribbons to exhibit field-induced inverse martensitic transformation behaviour and a large magnetocaloric effect. Under a field change of 5 T, a maximum magnetic entropy change ΔSM of 18.6 J kg−1 K−1 and an effective refrigerant capacity RCeff of up to 178 J kg−1 can be achieved, which are comparable with or even superior to those of Ni-rich Ni–Mn-based polycrystalline bulk alloys. The combination of high performance and low cost makes Mn–Ni–Co–Sn ribbons of great interest as potential candidates for magnetic refrigeration.
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Submitted on : Thursday, December 17, 2020 - 4:10:05 PM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM

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Zongbin Li, Yiwen Jiang, Zhenzhuang Li, César Fidel Sánchez Valdés, José Luis Sánchez Llamazares, et al.. Phase transition and magnetocaloric properties of Mn 50 Ni 42− x Co x Sn 8 (0 ≤ x ≤ 10) melt-spun ribbons. International Union of Crystallography journal, International Union of Crystallography 2018, 5 (1), pp.54-66. ⟨10.1107/S2052252517016220⟩. ⟨hal-03080326⟩



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