Mobility of hydrogen around nitrogen and oxygen trapping sites: phonon assisted tunneling parameters

Journal Article · Sat Nov 01 04:00:00 EST 1980 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(80)90053-X· OSTI ID:6536792

Zapp, P E; Birnbaum, H K

The mobility of H around O and N interstitial trapping sites has been studied in Nb using anelastic techniques. Hydrogen jump frequencies were measured in the temperature range 250 to 35/sup 0/K and significant deviations from an Arrhenius temperature dependence were observed. The data were fitted to the Flynn-Stoneham phonon assisted tunneling theory and the Debye temperatures, self trapping energies, and tunneling transition frequencies were determined for the O and N traps. These values are discussed in terms of a delocalized ring model for hydrogen diffusion and are related to the distortion fields around the trapping sites.

• Research Organization: Univ. of Illinois, Urbana
• DOE Contract Number: EY-76-C-02-1198
• OSTI ID: 6536792
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 28:11; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ATOM TRANSPORT
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEBYE TEMPERATURE
DIFFUSION
ELEMENTS
HYDROGEN
INTERSTITIALS
METALS
MOBILITY
NEUTRAL-PARTICLE TRANSPORT
NIOBIUM
NONMETALS
PHONONS
POINT DEFECTS
QUASI PARTICLES
RADIATION TRANSPORT
REFRACTORY METALS
TRANSITION ELEMENTS
TRAPPING
TUNNEL EFFECT