Diffusion of hydrogen in Nb/sub 1-//sub y/V/sub y/ alloys

Journal Article · Tue Nov 15 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.10217· OSTI ID:6747416

Brouwer, R C; Salomons, E; Griessen, R

A model is proposed for interstitial diffusion in a disordered alloy. Diffusion is described in terms of single-jump processes with an activation energy and a prefactor depending on the chemical and physical structure of the initial and final sites. Site-dependent activation energies, prefactors, selective blocking factors, and attractive interstitial-interstitial interactions are taken into account. Using the site energies and the density-of-sites function as measured by Feenstra et al., we calculate for the first time the temperature and concentration dependence of the diffusion coefficient for hydrogen in the complete Nb/sub 1-//sub y/V/sub y/ alloy system without any further fit parameter. The agreement between calculated and experimental activation energies is excellent by taking the same saddle-point energy as for pure Nb and V over the complete Nb/sub 1-//sub y/V/sub y/ alloy system. By combining data extracted from pressure-composition isotherms with diffusion data, it is possible to obtain information on the density of sites, the site energies, and the saddle-point energies of a complete binary alloy system.

• Research Organization: Natuurkundig Laboratorium, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
• OSTI ID: 6747416
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:15; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
ALLOYS
ATOM TRANSPORT
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
ENERGY
HYDROGEN
INTERSTITIALS
NEUTRAL-PARTICLE TRANSPORT
NIOBIUM ALLOYS
NONMETALS
POINT DEFECTS
QUANTITY RATIO
RADIATION TRANSPORT
TEMPERATURE DEPENDENCE
VANADIUM ALLOYS