Amorphization of the CeFe2 Laves phase compound by hydrogen absorption |
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| Affiliation: | 1. Department of Physics, Indian Institute of Technology Kharagpur, 721302, India;2. Department of Applied Science, Haldia Institute of Technology, Haldia 721657, India;3. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India;1. Normandie université, Unicaen, Média Normandie, esplanade de la Paix, 14032 Caen cedex 5, France;2. Unité régionale de formation à l’information scientifique et technique (Urfist), École nationale des Chartes, PSL Research University, 17, rue des Bernardins, 75005 Paris, France;3. Laboratoire « Dispositifs d’information et de communication à l’ère numérique » (Dicen), EA7339, Conservatoire national des arts et métiers, 292, rue Saint-Martin 75003 Paris, France;1. Graduate School of Maritime Sciences, Kobe University, Fukaeminami, Higashinada, Kobe, Hyogo 658-0022, Japan;2. Materials Development Group, Superconducting Properties Unit, National Institute for Materials Science, Sengen, Tsukuba, Ibaraki 305-0047, Japan;1. Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 Japan;2. Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, 351-0198 Japan;3. Radioisotope Research Center, Osaka University, Suita, Osaka, 565-0871 Japan;1. Center of Materials Technology and Photonics, School of Engineering, Technological Educational Institute of Crete, Heraklion, Greece;2. Chemistry and Physics, “Al.I. Cuza” University of Iasi, Iasi, Romania;3. Institute of Electronic Structure & Laser (IESL), Foundation for Research and Technology (FORTH) Hellas, Heraklion, Greece;4. Electrical Engineering Department, School of Engineering, Technological Educational Institute of Crete, Heraklion, Greece |
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| Abstract: | Structural changes of the CeFe2 Laves phase compound during the hydrogen absorption and desorption process have been investigated by X-ray diffraction, transmission electron microscopy, thermal analysis and magnetic property measurements. The transition from the crystalline to the amorphous state has been confirmed to occur below about 500 K, where the formation of the elemental hydride, CeH2, is virtually hindered. The whole crystalline phase does not change to the amorphous state in a uniform manner, but a part of the crystalline phase changes to the amorphous one which grows with further hydrogenation. The requirements for alloys to undergo hydrogen-induced amorphization were discussed. The proposed requirements are for alloys - 1.(i) to have the Laves structure,
- 2.(ii) to contain hydride-forming elements
- 3.(iii) to have either a low melting point or a tendency to decompose into other intermetallic compounds.
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