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Magnetic and magnetocaloric properties in GdZn2 synthesized by ball milling
Journal of Rare Earths ( IF 5.2 ) Pub Date : 2020-12-16 , DOI: 10.1016/j.jre.2020.12.007
Keisuke T. Matsumoto 1 , Akihiro Hosokawa 1 , Koichi Hiraoka 1
Affiliation  

In this study, we prepared GdZn2 by mechanical alloying method and measured its magnetization to reveal the magnetic and magnetocaloric properties. For a milling time (MT) ≥ 10 and 20 h, the GdZn2 phase was confirmed by X-ray diffraction measurements. For MT = 40 and 60 h, amorphous like patterns are observed. For MT = 10 and 20 h, magnetization (M) as a function of temperature below 80 K shows ferromagnetic-like increase. The observed values of M are 4.5 μB at 5 K for MT = 10 and 20 h, which is smaller than that of the theoretical expected value of 7 μB. For MT = 40 and 60 h, the long-range ferromagnetic order collapses because there is no spontaneous magnetization. The value of ΔT, where ΔT is the full width at half maximum of the magnetic entropy change (ΔSm (T)), increases significantly for MT ≤ 20 h because of the gradual release of magnetic entropy by the milling effect. Since M decreases with increasing MT, the maximum values of |ΔSm|, the relative cooling power, and the refrigerant capacity also decreases.



中文翻译:

球磨法合成 GdZn2 的磁性和磁热性质

在这项研究中,我们通过机械合金化方法制备了 GdZn 2并测量了它的磁化强度,以揭示其磁性和磁热性能。对于研磨时间 (MT) ≥ 10 和 20 小时,GdZn 2相通过 X 射线衍射测量得到证实。对于 MT = 40 和 60 小时,观察到类似无定形的图案。对于 MT = 10 和 20 h,磁化强度 ( M ) 作为温度低于 80 K 的函数,显示出类铁磁体的增加。对于 MT = 10 和 20 h, M在 5 K时的观测值为4.5 μB,小于理论预期值 7 μB. 对于 MT = 40 和 60 小时,长程铁磁有序崩溃,因为没有自发磁化。ΔT的值,其中ΔT是磁熵变化的半峰全宽 ( ΔS m ( T )),在 MT ≤ 20 h 时显着增加,因为研磨效应会逐渐释放磁熵。由于M随着MT的增加而减小,| ΔS m |的最大值、相对冷却功率和制冷剂容量也减小。

更新日期:2020-12-16
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