Hydrogen-induced magnetic and structural transformations of GdCu |
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Authors: | Masanori Hara Naomi Hatakeyama Kuniaki Watanabe Katsunori Mori |
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Institution: | a Hydrogen Isotope Research Center, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan b Faculty of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan |
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Abstract: | 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+H2→GdH2+GdCu2 . The magnetization was evaluated by the expression χtotal=(1-x)χGdCu+(x/2)(χGdH2+χGdCu2). GdCu hydride was not observed. Hydrogenation beyond H]/GdCu]>1 gave rise to the disproportionation of GdCu2 causing the change in magnetization. |
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Keywords: | 75 50 &minus y 81 05 Je |
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