Phase transition and magnetocaloric effect in particulate Fe-Rh alloys
Phase transition and magnetocaloric effect in particulate Fe-Rh alloys
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DOI：
10.1007/s10853-020-04921-y
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发表时间：
2020-06-15
影响因子：
4.5
通讯作者：
Fu, Hao
中科院分区：
文献类型：
--
作者：
Cao, Yutao;Yuan, Yue;Fu, Hao
采用固相还原法制备了FexRh100-x（x = 50、48、45、40和35）二元合金的微颗粒，并对其结构性能、磁性能和细胞毒性进行了表征。x射线衍射结果表明，Fe(50)Rh（50）合金为单一有序α′相，而面心立方无序γ′相随着Rh含量的增加而增加。合金的磁化行为表明，由于颗粒合金中元素的不均匀性，α′相由铁磁性和反铁磁性组分组成。在0 ~ 3 T的磁场变化下，Fe(50)Rh（50）粒子的最大磁熵变化和相对制冷量分别达到9.7 J/kg K和230 J/kg。尽管Fe(50)Rh（50）微粒子在一阶过渡材料中具有中等的磁熵，但由于其相对冷却能力大和细胞毒性低，因此在生物医学应用中具有很大的前景。
Micro-sized particles of FexRh100-x(x = 50, 48, 45, 40, and 35) binary alloys were synthesized by a solid-phase reduction method and their structural properties, magnetic properties and cytotoxicity have been characterized. From X-ray diffraction results, the Fe(50)Rh(50)alloy is in a single chemically ordered alpha ' phase while the face-centered cubic disordered gamma phase arises and increases with Rh content whenxis smaller than 50. The magnetization behavior of the alloys demonstrates that the alpha ' phase consists of ferromagnetic and antiferromagnetic components due to the nonuniformity of elements in the particulate alloys. The maximal magnetic entropy change and the relative refrigeration capacity of the Fe(50)Rh(50)particles reach 9.7 J/kg K and 230 J/kg, respectively, with a 0-3 T magnetic field change. Despite its moderate magnetic entropy among the first-order transition materials, Fe(50)Rh(50)microparticles are promising for biomedical applications due to its large relative cooling power and low cytotoxicity.