Comparison of Magnetic and Electrical Properties in Amorphous, Quasicrystalline and Crystalline States of Al-Mn Alloys
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概要
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The magnetic and electrical properties in the amorphous, quasicrystalline and crystalline states of Al-Mn and Al-Mn-Si alloys have been investigated and compared because the amorphous structure is often correlated with the icosahedral structure, and the structures of some crystalline compounds are resemble to that of the quasicrystalline alloys. The magnetizations measured up to 300 kOe for the amorphous alloys are slightly larger than those of the quasicrystalline alloys, and the paramagnetic Curie temperature of the former alloys is larger than that of the latter alloys. The magnitude of effective magnetic moment P_<eff> determined from the Curie-Weiss law for crystalline alloys is qualitatively explained in terms of the Pauling valence. The value of P_<eff> of the quasicrystalline alloys is almost the same as that of the amorphous ones and about two times that of the crystalline alloys at the same composition. From the magnetic measurements it becomes clear that Mn sites are partly magnetic, and the magnetic properties are drastically modified by substituting some fraction of Mn for other transition metals such as Cr. The spin-glass behavior is observed and the spin freezing temperature lies on the same line as a function of Mn content for both the amorphous and quasicrystalline alloys. The electrical resistivity of the quasicrystalline alloys with a relatively high Mn content is extremely large accompanying a negative temperature coefficient as that of the amorphous alloys. After crystallization, its magnitude is reduced drastically and the temperature dependence curves of the alloys with high concentrations show a positive curvature in the wide temperature range. Therefore, the magnitude and the temperature dependence of electrical resistivity of the quasicrystalline alloys are very different from those of the crystalline alloys. From these results, it is concluded that the magnetic and electrical properties of Al-Mn quasicrystalline alloys are very similar to those of amorphous ones and distinctly different from those of the crystalline alloys.
- 1989-03-20
著者
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Goto Tsuneaki
Department Of Applied Physics Tokyo Institute Of Technology
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Goto Tsuneaki
Department Of Materials Science Faculty Of Engineering Tohoku University:institute For Solid State P
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Fukamichi Kazuaki
Department Of Aterials Science Graduate School Of Engineering Tohoku University
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Fukamichi Kazuaki
Department Of Materials Science Faculty Of Engineering Tohoku University:(present Address)institute
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