Hydrogen Diffusion in the Laves-Phase Compound TiCr1.78 (Articolo in rivista)

Type
Label
  • Hydrogen Diffusion in the Laves-Phase Compound TiCr1.78 (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.msea.2008.09.108 (literal)
Alternative label
  • G. Mazzolai; B. Coluzzi; A. Biscarini; F.M. Mazzolai; A. Tuissi; F. Agresti; G. Principi; S. Lo Russo (2009)
    Hydrogen Diffusion in the Laves-Phase Compound TiCr1.78
    in Materials science & engineering. A, Structural materials: properties, microstructure and processing
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Mazzolai; B. Coluzzi; A. Biscarini; F.M. Mazzolai; A. Tuissi; F. Agresti; G. Principi; S. Lo Russo (literal)
Pagina inizio
  • 139 (literal)
Pagina fine
  • 142 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 521-522 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In Press, Accepted Manuscript, Available online 9 March 2009 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Perugia, Department of Physics, Via A. Pascoli 5, 06100 Perugia, Italy; Institute for Energy and Interphases, CNR-IENI, C.so Promessi Sposi, 29, Lecco, Italy; University of Padua, Dept. of Mech. Eng., via Marzolo 8, 35131 Padua, Italy; University of Padua, Physics Dept., via Marzolo 8, 35131 Padua, Italy; Università Telematica e-Campus, Via Isimbardi 10, Novedrate (Co), Italy (literal)
Titolo
  • Hydrogen Diffusion in the Laves-Phase Compound TiCr1.78 (literal)
Abstract
  • The temperature dependence of the Young's modulus and of the internal friction (IF) has been investigated between 80 and 300 K at acoustical frequencies in the hexagonal (C14) Laves-phase TiCr1.78 charged with hydrogen. In this compound H occupies tetrahedral interstitial sites which are grouped in interlinked hexagons. A mechanical relaxation has been found at around 120 K (f = 5.4 kHz), which appears to be due to tunnelling transitions of delocalized H from one hexagon to the other. The rate of H absorption has been investigated at high temperature (660-1200 K) and the H diffusion coefficient has been derived from the pressure measurement as a function of time. A cumulative Arrhenius plot of IF and absorption diffusion data exhibits a non-exponential behaviour, which is due to a change in the diffusion mechanism from over-barrier hopping at high temperature to phonon-assisted tunnelling at low temperature. (literal)
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