Vibrational dynamics of some amorphous and quasicrystalline alloys

Inelastic nuclear resonance scattering has been used to get partial vibrational density of states (PVDOS) of iron in two classes of systems: (i) quasicrystalline Al 63.5Cu 24Fe 12.5, its rhombohedral approximant and Al 70Cu 20Fe 10 crystalline (tetragonal) phase and (ii) amorphous Fe 80B 20 and its...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2001-05, Vol.304, p.731-734
Main Authors: Gupta, Ajay, Shah, P., Lalla, N.P., Dasannacharya, B.A., Harami, T., Yoda, Y., Seto, M., Yabashi, Makina, Kikuta, Seishi
Format: Article
Language:English
Subjects:
Amorphous and quasicrystalline alloys
Partial vibrational density of iron
Phonons
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Summary:Inelastic nuclear resonance scattering has been used to get partial vibrational density of states (PVDOS) of iron in two classes of systems: (i) quasicrystalline Al 63.5Cu 24Fe 12.5, its rhombohedral approximant and Al 70Cu 20Fe 10 crystalline (tetragonal) phase and (ii) amorphous Fe 80B 20 and its crystalline counterpart. PVDOS in quasicrystalline phase consists of a rather broad maximum at 28 meV with a small hump at 21 meV, and is somewhat similar to that in crystalline Al 70Cu 20Fe 10. Results suggest some similarity in the iron environment in quasicrystalline, approximant and crystalline phases. Amorphous Fe 80B 20 exhibits an excess density of states as compared to the crystalline phase in the energy range 4–21 meV, which may be attributed to the boson peak.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(00)01597-5