Acoustic properties of borate glasses (Articolo in rivista)

Type
Label
  • Acoustic properties of borate glasses (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Alternative label
  • Giovanni Carini , Giuseppe Carini, Giovanna DAngelo Giovanna, Gaspare Tripodo , Antonio Bartolotta (2004)
    Acoustic properties of borate glasses
    in Journal of non-crystalline solids
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giovanni Carini , Giuseppe Carini, Giovanna DAngelo Giovanna, Gaspare Tripodo , Antonio Bartolotta (literal)
Pagina inizio
  • 345 (literal)
Pagina fine
  • 346 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 345 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • - Dipartimento di Fisica and INFM, Universita` di Messina,I-98166, Messina, Italy - Istituto per i Processi Chimico-Fisici del C.N.R., Sezione di Messina, I-98123 Messina, Italy (literal)
Titolo
  • Acoustic properties of borate glasses (literal)
Abstract
  • The attenuation and velocity of ultrasonic waves of frequencies in the range from 10MHz to 50MHz have been measured in (M2O)0.14(B2O3)0.86 borate glasses (M = Li, Cs or Ag) as a function of temperature between 15K and 300K. Broad relaxation peaks characterize the acoustic attenuation at temperatures below 100K and are paralleled by corresponding dispersive behaviors of the sound velocity. The velocity of sound waves decreases with increasing temperature in all the glasses, the decrease as the temperature is increased being larger in glasses containing cesium than in those with lithium or silver. Above 100K the ultrasonic velocity is regulated by the vibrational anharmonicity and shows a nearly linear temperature dependence, whose slope scales with the size of the network modifier ion. The results suggest that the local motion of structural defects and the anharmonicity in borate glasses are strongly affected by the polarizing power of network modifier ions. (literal)
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