Hydrogen-induced magnetic and structural transformations of GdCu

被引：4

作者：

Hara, Masanori ^{[1
]}

Hatakeyama, Naomi ^{[2
]}

Akamaru, Satoshi ^{[1
]}

Watanabe, Kuniaki ^{[1
]}

Nishimura, Katsuhiko ^{[2
]}

Mori, Katsunori ^{[2
]}

Matsuyama, Masao ^{[1
]}

机构：

[1] Toyama Univ, Hydrogen Isotope Res Ctr, Toyama 9308555, Japan

[2] Toyama Univ, Fac Engn, Toyama 9308555, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 05期

关键词：

Gadolinium copper compound; Hydrogen; Disproportionation; Gadolinium hydride; GDM COMPOUNDS; HYDRIDE; CU; PD;

D O I：

10.1016/j.jmmm.2008.09.038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetization of GdCu induced by hydrogen uptake was measured within the temperature range of 4.2 to 300 K, occurring phase changes were followed by X-ray diffraction measurements at ambient temperature. The prepared GdCu powder of CsCl-type structure readily absorbed hydrogen at ambient temperature, where hydrogen pressure was below 100 kPa. Hydrogenation changed the magnetism of GdCu in a complex manner from an antiferromagnetic-like type to a paramagnetic-like one. The changes in magnetic properties of GdCu by hydrogenation are governed by hydrogen-induced disproportionation. Within the composition range 0 <[H]/[GdCu]< 1, GdCu disproportionated according to 2GdCu+H(2 ->)GdH(2)+GdCu(2). The magnetization was evaluated by the expression chi(total) = (1-x)chi(GdCu) + (x/2)(chi(GdH2) + chi(GdCu)) hydride was not observed. Hydrogenation beyond [H]/[GdCu] > 1 gave rise to the disproportionation of GdCu(2) causing the change in magnetization. (c) 2008 Elsevier B. V. All rights reserved.

引用

页码：423 / 428

页数：6

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