On the magnetic properties of pseudo-Laves phases RE_{1鈭?span style='font-style: italic'>y}Y_yNi_{4鈭?span style='font-style: italic'>x}Al_xMg with RE = La, Ce and Gd prepared by both melting and ball milli

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• 作者：S. Couillaud^a ; B. Chevalier^a ; V. Paul-Boncour^b ; J.-L. Bobet^a ; ^{bobet@icmcb-bordeaux.cnrs.fr}
• 关键词：Magnetic properties ; Structural properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 June, 2012
• 卷：525
• 期：Complete
• 页码：166-171
• 文件大小：1059 K

摘要

Magnetic properties of RE_1鈭?em>yY_yNi_4鈭?em>xAl_xMg (RE = La, Ce and Gd) are reported. LaNi₄Mg displays a weak magnetization indicating that Ni is non magnetic as often observed in RENi₂ compounds. The magnetization of CeNi₄Mg compounds shows a Curie Weiss behaviour with an effective paramagnetic moment 渭_eff = 2.2 渭_B. The magnetization of Gd compounds is dominated by the contribution of Gd moment with a paramagnetic effective moment close to 7.7 渭_B/Gd for all studied compounds. The Curie temperature, which is 75 K for GdNi₂, decreases almost linearly with the number of Gd neighbours when more than half Gd is replaced by Y. The decrease of crystallinity of GdNi₄Mg, which is monitored by ball milling and heat treatment, strongly influences the magnetic properties and a relationship between the transition temperature and the crystallites size is reported.