Hydrogen diffusion in Nb1−y Vy alloys

Abstract

Tracer diffusion coefficients Dt of hydrogen in niobium and some Nb1−y VyHx alloys have been measured and are compared with chemical diffusion coefficients Dc from the literature. Nuclear magnetic resonance pulsed field gradient techniques were used to measure Dt. Comparison of the two diffusion coefficients is made taking into consideration the thermodynamic factor (kBT)−1[∂μ∂(ln x)] which is obtained from pressure-composition isotherms for the alloys. The comparisons indicate satisfactory agreement between the two measures of the diffusion coefficient.