Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 46 (1985) C10-83-C10-86
DOI: 10.1051/jphyscol:19851018
RESISTANCE STUDIES OF HYDROGEN DIFFUSION IN NIOBIUM
E.A. CLARK1, P. TZANETAKIS2 et H.K. BIRNBAUM11 Department of Metallurgy and Mining Engineering and Materials Research Laboratory, University of Illinois, Urbana, IL 61801, U.S.A.
2 Department of Physics, University of Crete, Heraklion, Crete, Greece.
Abstract
Hydrogen diffusion in Nb was studied using thermotransport to establish concentration gradients in a periodic width modulated sample. The resistance of the sample was measured as a function of time, by a Kelvin bridge circuit, as the perturbed hydrogen distribution returned to uniform concentration. Results for a H/Nb = 0.001 sample, measured in the temperature range 300 K and 180 K show the diffusivity of H to be two to four times larger than that measured by the Gorsky effect. When fitted to the Arrhenius relation, Q = 0.078 ± .001 eV/atom and D0 = 3.0 ± 0.7 x 10-4 cm2/s.