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Abstract：
Ni-Mn-Sn-based ferromagnetic shape memory alloys (FSMAs) are multifunctional materials that are promising for solid-state refrigeration applications based on the magnetocaloric effect (MCE) and elastocaloric effect (eCE). However, a combination of excellent multi-caloric properties, suitable operating temperatures, and mechanical properties cannot be well achieved in these materials, posing a challenge for their practical application. In this work, we systematically study the phase transformations and magnetic properties of Ni50-xMn38Sn12Cux (x = 0, 2, 3, 4, 5, and 6) and Ni50-yMn38Sn12Fey (y = 0, 1, 2, 3, 4, and 5) alloys, and the magnetic-structural phase diagrams of these alloy systems are reported. The influences of the fourth-element doping on the phase transitions and magnetic properties of the alloys are elucidated by first-principles calculations. This work demonstrates that the fourth-element doping of Ni-Mn-Sn-based FSMA is effective in developing multicaloric refrigerants for practical solid-state refrigeration.
摘要：
基于Ni-Mn-Sn的铁磁形状记忆合金（FSMA）是多功能材料，有望基于磁热效应（MCE）和弹性热效应（eCE）用于固态制冷应用。然而,结合了优异的多热量特性，合适的工作温度,这些材料不能很好地实现机械性能，对它们的实际应用提出了挑战。在这项工作中,我们系统地研究了Ni50-xMn38Sn12Cux（x=0，2，3，4，5和6）和Ni50-yMn38Sn12Fey（y=0，1，2，3，4和5）的相变和磁性合金，并报道了这些合金体系的磁结构相图。通过第一原理计算阐明了第四元素掺杂对合金相变和磁性能的影响。这项工作表明，基于Ni-Mn-Sn的FSMA的第四元素掺杂在开发用于实际固态制冷的多参数制冷剂方面是有效的。
