Abstract The effect of hydrostatic pressure on the martensitic transformation and magnetocaloric effect has been systematically studied in Mn44.7Ni43.5Sn11.8 ribbons. The melt-spun ribbons crystallize along the [400] direction, which is perpendicular to the surface of the ribbon. The martensitic transformation temperatures shift from 266.5 K to 281.0 K by applying hydrostatic pressure of 0.75 GPa. Under the magnetic field of 30 kOe, the value of d T M / d P is about 19.3 K GPa−1, indicating a broadening of working temperature span for magnetic refrigeration at room temperature. At ambient pressure, a relatively large entropy change value of 35.9 J kg−1 K−1 is obtained under a magnetic field of 30 kOe, which would be related to the orientation of crystal structure.

中文翻译：

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静水压力对Mn44.7Ni43.5Sn11.8碳带马氏体转变和磁热效应的影响

摘要 系统研究了静水压力对Mn44.7Ni43.5Sn11.8薄带马氏体转变和磁热效应的影响。熔纺丝带沿 [400] 方向结晶，该方向垂直于丝带表面。通过施加 0.75 GPa 的静水压力，马氏体转变温度从 266.5 K 转变为 281.0 K。在30 kOe的磁场下，d TM / d P 的值约为19.3 K GPa-1，表明室温下磁制冷的工作温度范围扩大。在环境压力下，在30 kOe的磁场下获得了相对较大的熵变值35.9 J kg-1 K-1，这与晶体结构的取向有关。