Inelastic-neutron-scattering measurements of phonons in icosahedral Al-Li-Cu

Journal Article · Mon Apr 01 00:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.8763· OSTI ID:5564339

Goldman, A I; Stassis, C ^[1]; Bellissent, R; Moudden, H; Pyka, N ^[2]; Gayle, F W ^[3]

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1. Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011 (USA)
2. Laboratoire Leon Brillouin, Centre d'Etudes Nucleaires Saclay, 91191 Gif-sur-Yvette CEDEX, (France)
3. Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (USA)

Inelastic-neutron-scattering measurements on a single grain of icosahedral Al-Li-Cu are presented. Within experimental error the acoustic-phonon dispersion at small, but finite, {bold q} is independent of direction, confirming the isotropic elasticity expected for icosahedral crystals. By following the longitudinal-phonon dispersion curve along a fivefold axis we can identify the location of quasi-Brillouin-zone boundary.'' The measurements also suggest the presence of an optical or localized mode along the twofold axis at approximately 10--11 meV. We compare these results to theoretical calculations for one- and two-dimensional quasiperiodic systems.

• OSTI ID: 5564339
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:10; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
PHONONS
COPPER ALLOYS
LITHIUM ALLOYS
DISPERSION RELATIONS
ELASTICITY
INELASTIC SCATTERING
ISOTROPY
NEUTRON DIFFRACTION
ALLOYS
COHERENT SCATTERING
DIFFRACTION
MECHANICAL PROPERTIES
QUASI PARTICLES
SCATTERING
TENSILE PROPERTIES
360104* - Metals & Alloys- Physical Properties