High frequency dynamics of an oricntationally disordered molecular crystal (Articolo in rivista)

Type
Label
  • High frequency dynamics of an oricntationally disordered molecular crystal (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Angelini, R; Scopigno, T; Beraud, A; Ruocco, G (2006)
    High frequency dynamics of an oricntationally disordered molecular crystal
    in Journal of non-crystalline solids
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Angelini, R; Scopigno, T; Beraud, A; Ruocco, G (literal)
Pagina inizio
  • 4552 (literal)
Pagina fine
  • 4555 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 352 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma La Sapienza, SOFT, CRS, INFM,CNR, I-00185 Rome, Italy; ESRF, F-38043 Grenoble, France; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy (literal)
Titolo
  • High frequency dynamics of an oricntationally disordered molecular crystal (literal)
Abstract
  • The dynamic structure factor of the polycrystalline plastic crystal 1-cyanoadamantane has been measured in the THz frequency region by inelastic X-ray scattering as a function of the exchanged momentum Q in the range 1-10 nm(-1) and as a function of the temperature in the two solid disordered phases: plastic crystal and glassy crystal. We find that the dispersion of the acoustic excitations is crystal-like in the two phases and that the attenuation Gamma(Q) shows a negligible T dependence similarly to structural glasses and a Q(x) behavior with 1.15 < alpha < 1.50 at variance with structural glasses characterized by a Q(2) dependence. (c) 2006 Elsevier B.V. All rights reserved. (literal)
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