Dynamical properties of icosahedral quasicrystal and glassy Al77Cu13V10: A comparative study by inelastic neutron scattering
✍ Scribed by Kaoru Shibata; Hiroshi Mizuseki; An Pang Tsai; Kenji Susuki
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 175 KB
- Volume
- 213-214
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
According to the structural study of the icosahedral quasicrystal and glassy AI77Cu~ 3V1o, it has been shown that these two materials have the same nanoscale structure unit, namely, the icosahedral atomic cluster. However, the glassy material has a dense random-packing structure which is composed of the icosahedral atomic clusters, without any long-range orientational ordering. Therefore, the icosahedral quasicrystal and glassy AI~Cu13V~0 are interesting samples for studying the dynamical properties of disordered materials.
We have measured the dynamical structure factors S(Q, ~,J) of icosahedral and glassy A177Cul 3Vl o, and the crystallized sample at room temperature by means of inelastic neutron scattering. Measurements were performed on the invertedgeometry crystal-analyzer type time-of-flight spectrometers LAM-40, which is installed at KENS. The generalized vibrational density of states G(,)) were also obtained. The low-energy excitation modes in icosahedral and glassy A177CuI3VIo were observed in the energy range below 8 meV.
In contrast to the significant difference observed in the static structure factors S(Q) of icosahedral and glassy A177Cut3V,o, their dynamical properties are nearly identical and quite different from that of the crystallized sample.