http://www.cnr.it/ontology/cnr/individuo/prodotto/ID57200
Hydrogen and deuterium tunnelling in scandium (Articolo in rivista)
- Type
- Label
- Hydrogen and deuterium tunnelling in scandium (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.2003.08.094 (literal)
- Alternative label
F. Trequattrini (a); F. Cordero (b); G. Cannelli (c); R. Cantelli (a) (2004)
Hydrogen and deuterium tunnelling in scandium
in Materials science & engineering. A, Structural materials: properties, microstructure and processing
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- F. Trequattrini (a); F. Cordero (b); G. Cannelli (c); R. Cantelli (a) (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
- Conference: 13th International Conference on Internal Friction and Ultrasonic Attentuation in Solids Location: Bilbao, SPAIN Date: JUL 08-12, 2002 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
- fasc. (1-2). Elsevier.
13th International Conference on Internal Friction and Ultrasonic Attenuation in Solids. (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- (a) Dipartimento di Fisica, Università di Roma \"La Sapienza\", I-00185 Roma, and INFM, Italy
(b) CNR, Istituto di Acustica \"O.M. Corbino\", I-00133 Roma, and INFM, Italy
(c) Dipartimento di Fisica, Università della Calabria, I-87036 Cosenza, and INFM, Italy (literal)
- Titolo
- Hydrogen and deuterium tunnelling in scandium (literal)
- Abstract
- A detailed study of the relaxation processes occurring below room temperature has been carried out by charging polycrystalline Sc with different amount of hydrogen and deuterium. For all the concentrations, we have observed relaxation effects ascribed to tunnelling of H (D) between the two equivalent first neighbour tetrahedral sites in the c direction, which strongly depend on the H (D) content. In diluted ScH (up to few hundreds ppm H), due to the presence of interstitial O, the main anelastic peak is related to the tunnelling of H trapped by O. Increasing the H (D) concentration the traps are saturated and new peaks appear at lower temperature. A marked isotope effect is observed; the peaks shift in temperature and are at least four times smaller with H than with D, when measured at the same frequency. In deuterated sample the main peak has been analysed in terms of the two-level-systems (TLS). A good fit for the case of 1 at.% D could be obtained with a relaxation time ??T-7 and a small distribution of the asymmetries. This indicates that, quite surprisingly, the rate in this temperature range is dominated by multiple phonons processes. (literal)
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