AustralieFrV1, Main, Exploration, bibRecord, 008B09

Propagating vibrational modes in the Zr-Be metallic glasses

Identifieur interne : 008B09 ( Main/Exploration ); précédent : 008B08; suivant : 008B10

Propagating vibrational modes in the Zr-Be metallic glasses

Auteurs : G. F. Syrykh [Russie] ; A. S. Ivanov [France] ; N. A. Klimenko [Russie] ; Yu. V. Lisichkin [Russie] ; H. Mutka [France] ; J. A. Stride [Australie]

Source :

Journal of physics. Condensed matter : (Print) [ 0953-8984 ] ; 2008.

RBID : Pascal:08-0262274

Descripteurs français

Pascal (Inist)
- Mode vibration, Facteur structure dynamique, Diffusion neutron, Diffusion inélastique, Transfert quantité mouvement, Transfert énergie, Dispersion phonon, Alliage binaire, Verre métallique, Zirconium alliage, Béryllium alliage.

English descriptors

KwdEn :
- Beryllium alloys, Binary alloys, Dynamic structure factor, Energy transfer, Inelastic scattering, Metallic glasses, Momentum transfer, Neutron diffusion, Phonon dispersion, Vibrational modes, Zirconium alloys.

Abstract

The dynamic structure factors, S(Q, E), for the Zr₇₀Be₃₀, Zr₆₀Be₄₀ and Zr₅₀Be₅₀ metallic glasses have been measured using neutron inelastic scattering on the IN4 spectrometer (ILL, Grenoble, France), over the range of momentum transfers 0.7 < h Q (Å^-1) < 7 and energy transfers 2 < E (meV) < 60. The constant- Q cuts through the dynamic structure factor and longitudinal current correlation function, J_l(Q, E), were obtained. The dispersion relations for two representations, S(Q, E) and J_l[(Q, E), were derived by fitting a Gaussian to the peaks. The specific low-energy modes (∼5 meV) as well as 'acoustic-phonon like' (∼16 meV) and 'optic-phonon like' excitations (∼47 meV) were observed in these metallic glasses with disparate mass and ionic radius components.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The dynamic structure factors, S(Q, E), for the Zr<sub>70</sub>
Be<sub>30</sub>
, Zr<sub>60</sub>
Be<sub>40</sub>
 and Zr<sub>50</sub>
Be<sub>50</sub>
 metallic glasses have been measured using neutron inelastic scattering on the IN4 spectrometer (ILL, Grenoble, France), over the range of momentum transfers 0.7 < h Q (Å<sup>-1</sup>
) < 7 and energy transfers 2 < E (meV) < 60. The constant- Q cuts through the dynamic structure factor and longitudinal current correlation function, J<sub>l</sub>
(Q, E), were obtained. The dispersion relations for two representations, S(Q, E) and J<sub>l</sub>
[(Q, E), were derived by fitting a Gaussian to the peaks. The specific low-energy modes (∼5 meV) as well as 'acoustic-phonon like' (∼16 meV) and 'optic-phonon like' excitations (∼47 meV) were observed in these metallic glasses with disparate mass and ionic radius components.</div>
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Propagating vibrational modes in the Zr-Be metallic glasses

Propagating vibrational modes in the Zr-Be metallic glasses

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Descripteurs français

English descriptors

Abstract

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