Vibrational dynamics of some amorphous and quasicrystalline alloys

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• 作者：Gupta ; Ajay ; Shah ; P. ; Lalla ; N.P. ; Dasannacharya ; B.A. ; Harami ; T. ; Yoda ; Y. ; Seto ; M. ; Yabashi ; Makina ; et. al.
• 关键词：Partial vibrational density of iron ; Amorphous and quasicrystalline alloys ; Phonons
• 刊名：Materials Science and Engineering ; A
• 出版年：2001
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：May 31, 2001
• 卷：304-306
• 期：Complete
• 页码：731-734
• 文件大小：152 K

摘要

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_63.5Cu₂₄Fe_12.5, its rhombohedral approximant and Al₇₀Cu₂₀Fe₁₀ crystalline (tetragonal) phase and (ii) amorphous Fe₈₀B₂₀ and its crystalline counterpart. PVDOS in quasicrystalline phase consists of a rather broad maximum at 28meV with a small hump at 21meV, and is somewhat similar to that in crystalline Al₇₀Cu₂₀Fe₁₀. Results suggest some similarity in the iron environment in quasicrystalline, approximant and crystalline phases. Amorphous Fe₈₀B₂₀ exhibits an excess density of states as compared to the crystalline phase in the energy range 4–21meV, which may be attributed to the boson peak.