Ultrasonic relaxations in borate glasses (Articolo in rivista)

Type
Label
  • Ultrasonic relaxations in borate glasses (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.msea.2003.01.002 (literal)
Alternative label
  • G. D'Angelo; G. Tripodo; G. Carini; A. Bartolotta; G. Di Marco (2004)
    Ultrasonic relaxations in borate glasses
    in Materials science & engineering. A, Structural materials: properties, microstructure and processing
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. D'Angelo; G. Tripodo; G. Carini; A. Bartolotta; G. Di Marco (literal)
Pagina inizio
  • 326 (literal)
Pagina fine
  • 329 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • 13th International Conference on Internal Friction and Ultrasonic Attenuation in Solids (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 370 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • - Dipartimento di Fisica and INFM, Università di Messina, Salita Sperone 31, I-98166 S. Agata, Messina, Italy - Istituto per i Processi Chimico-Fisici del C. N. R., Sezione di Messina, Via La Farina 237, I-98123 Messina, Italy (literal)
Titolo
  • Ultrasonic relaxations in borate glasses (literal)
Abstract
  • The attenuation and velocity of ultrasonic waves of frequencies in the range from 10 to 70MHz have been measured in M2O–B2O3 borate glasses (M: Li or Ag) as a function of temperature between 15 and 350 K. The velocity of sound waves decreases with increasing temperature in all the glasses, the decrease as the temperature is increased is larger in glasses containing silver than in those with lithium. A broad relaxation peak characterises the attenuation behaviour of the lithium and silver borate glasses at temperatures below 100K and is paralleled by a corresponding dispersive behaviour of the sound velocity. Above 100 K, the ultrasonic velocity shows a nearly linear behaviour regulated by the vibrational anharmonicity, which decreases with increasing content of modifier oxide and is smaller in lithium than in silver borates. These results suggest that the relaxation of structural defects and the anharmonicity of borate glasses are strongly affected by two parameters: the number of bridging bonds per network forming ion and the polarising power of network modifier ions which occupy sites in the existing interstices. (literal)
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