Abstract
Thermodynamically stable Al-Cu-Fe and Fe-doped ferromagnetic Al-Cu-Ge-Mn icosahedral quasicrystals are studied by57Fe transmission Mössbauer spectroscopy and X-ray diffraction experiments. Al65Cu20Fe15 quasicrystalline alloy was subjected to a mechanical grinding (MG) for up to 800 hours in a ball mill. Presence of the amorphous phase which co-exists with the quasicrystalline one is revealed in the early stage of MG. Mössbauer measurements were performed on icosahedral Al40Cu10−x Ge25Mn25Fe x quasicrystal (xε〈0.1; 3〉) in a temperature range from 10 K to 548 K. It was found that a magnetic transition occurs at about 30 K which is far belowT c reported in the literature. It is concluded that AlGeMn ferromagnet which is present in the samples does not affect the magnetic transition observed and the transition is an intrinsic property of the Al-Cu-Ge-Mn host alloy.
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Samples of icosahedral quasicrystals were kindly provided by Profs. A. Inoue, T. Masumoto and P. H. Shingu. Ball milling was performed in Kyoto University by a courtesy of Prof. P. H. Shingu. This work was supported by the project for priority areas on properties of quasicrystals (No. 01630003) from the Japanese Ministry of Education, Science and Culture.
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Miglierini, M., Nasu, S. & Kuwano, T. Local order of icosahedral quasicrystals studied by Mössbauer spectroscopy. Czech J Phys 43, 19–30 (1993). https://doi.org/10.1007/BF01589581
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DOI: https://doi.org/10.1007/BF01589581