Preservation of large low temperature magnetocaloric effect in metamagnetic intermetallic compounds RCu2 (R = Gd, Tb, Dy, Ho and Er) upon rapid solidification
作者:R. Rajivgandhi、J. Arout Chelvane、A.K. Nigam、S.K. Malik、R. Nirmala
DOI:10.1016/j.jallcom.2019.152659
日期:2020.1
this work, magnetic and magnetocaloric properties of melt-spun RCu2 (R = Gd, Tb, Dy, Ho and Er) compounds have been studied. The melt-spun samples have formed in the same orthorhombic crystal structure (space group Imma, no. 74) as that of the arc-melted samples but with a development of crystallographic texture and micron-size grains. The melt-spun ribbons of RCu2 (R = Gd, Tb, Dy, Ho and Er) order a
摘要 在这项工作中,研究了熔纺 RCu2(R = Gd、Tb、Dy、Ho 和 Er)化合物的磁性和磁热特性。熔纺样品形成了与弧熔样品相同的正交晶体结构(空间群 Imma,编号 74),但具有晶体结构和微米级晶粒的发展。RCu2 (R = Gd、Tb、Dy、Ho 和 Er) 的熔纺带分别在 43 K、51 K、28 K、10 K 和 11 K (TN) 处呈反铁磁性。订购温度与电弧熔化样品的订购温度几乎相同。RCu2 化合物在 TN 以下显示一个或多个场致跃迁。所以,当磁场变化大于超磁临界场时,在这些化合物中观察到正常的磁热效应,而在较小的场变化时观察到逆磁热效应。微粒似乎没有抹掉变磁转变。等温磁熵变的最大值ΔSmmax约为-2.1 Jkg-1K-1、-5.5 Jkg-1K-1、-5.2 Jkg-1K-1、-17.2 Jkg-1K-1和-11.7 Jkg-1K-对于 50 kOe 场变化的熔纺