Enhanced magnetocaloric performances and tunable martensitic transformation in Ni35Co15Mn35–xFexTi15 all-d-metal Heusler alloys by chemical and physical pressures
Enhanced magnetocaloric performances and tunable martensitic transformation in Ni35Co15Mn35–xFexTi15 all-d-metal Heusler alloys by chemical and physical pressures
复制标题
通过化学和物理压力增强 Ni35Co15Mn35-xFexTi15 全 d 金属 Heusler 合金的磁热性能和可调马氏体转变
DOI：
10.1007/s40843-021-1747-3
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Lingwei Li
中科院分区：
文献类型：
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作者：
Yong Li;Liang Qin;Siyuan Huang;Lingwei Li
基于磁热效应的固态磁制冷技术是一种环境友好的高能效技术。寻找或设计合适的具有大磁效应的磁性材料是目前的主要目标之一。本论文在Ni_（35）Co_（15）Mn_（35-x）Fe_xTi_（15）全金属Heusler合金中施加化学压力和流体静压，从实验和理论上系统地研究了它们的晶体结构、物相和磁热性能。所有合金在室温下均以有序的B2型结构结晶，Fe原子均占据Mn（B）位。随着Fe含量的增加和体积的减小，总磁矩逐渐减小。马氏体相变温度随Fe含量的增加而降低，随静水压力的增加而升高。此外，通过施加压力也可以获得明显增强的磁热性能。当ΔH = 20（50）kOe时，磁熵变和制冷量的最大值分别为15.61（24.20）J（kg K）-1和109.91（347.26）J kg-1。这些磁热性能上级最近报道的大多数著名材料，表明活性MC的潜在应用。
The solid-state magnetic cooling (MC) method based on the magnetocaloric effect (MCE) is recognized as an environmentally friendly and high-energy-efficiency technology. The search or design of suitable magnetic materials with large MCEs is one of the main targets at present. In this work, we apply the chemical and hydrostatic pressures in the Ni_(35)Co_(15)Mn_(35–x)Fe_xTi_(15) all-d-metal Heusler alloys and systematically investigate their crystal structures, phases, and magnetocaloric performances experimentally and theoretically. All the alloys are found to crystallize in an ordered B2-type structure at room temperature and the atoms of Fe are confirmed to all occupy at sites Mn(B). The total magnetic moments decrease gradually with increasing Fe content and decreasing of volume as well. The martensitic transformation temperature decreases with the increase of Fe content, whereas increases with increasing hydrostatic pressure. Moreover, obviously enhanced magnetocaloric performances can also be obtained by applied pressures. The maximum values of magnetic entropy change and refrigeration capacity are as high as 15.61(24.20) J (kg K)–1 and 109.91(347.26) J kg~(–1) with ΔH = 20(50) kOe, respectively. These magnetocaloric performances are superior to most of the recently reported famous materials, indicating the potential application for active MC.