Non-ergodicity in a locally ordered fragile glass former (Articolo in rivista)

Type
Label
  • Non-ergodicity in a locally ordered fragile glass former (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Comez, L; Corezzi, S; Monaco, G; Verbeni, R; Fioretto, D (2006)
    Non-ergodicity in a locally ordered fragile glass former
    in Journal of non-crystalline solids
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Comez, L; Corezzi, S; Monaco, G; Verbeni, R; Fioretto, D (literal)
Pagina inizio
  • 4531 (literal)
Pagina fine
  • 4535 (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 Perugia, Dipartimento Fis, INFM, UdR PG, I-06123 Perugia, Italy; Univ Roma La Sapienza, INFM, CRS, SOFT, I-00185 Rome, Italy; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; European Synchrotron Radiat Facil, F-38043 Grenoble, France (literal)
Titolo
  • Non-ergodicity in a locally ordered fragile glass former (literal)
Abstract
  • We measure the dynamic structure factor of m-toluidine through inelastic X-ray scattering in the mesoscopic Q range between 1 and 10 nm(-1), where the static structure factor exhibits a prepeak resulting from a molecular spatial organization in nanometer size clusters, due to the formation of hydrogen bonds. We present experimental evidence of the square-root cusp in the temperature behavior of the non-ergodicity factor of in-toluidine which supports the view that the mode-coupling theory succeeds in describing the dynamics of supercooled molecular liquids, even for liquids with a local order, notwithstanding the cage formation is controlled by a mechanism different from the packing constraints typical of simple liquids. Moreover, we report on the behavior of the non-ergodicity factor in the low-temperature and wavevector regimes, finding a confirmation of the phenomenologic law proposed by Scopigno et al. [T. Scopigno, G. Ruocco, F. Sette; G. Monaco, Science 302 (2003) 849] which correlates the vibrational dynamics of the glass to the fragility of the supercooled liquid. (c) 2006 Published by Elsevier B.V. (literal)
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