Determination of Diffusion Coefficient of Hydrogen in Metals and Their Elastic Modulus by Generalised Impedance

Generalised Impedance P. ZOLTOWSKI and B. LEGAWIEC, J. Electroanal. Chem., 2004, 572, (2), 205–210 Transport of H in elastic metals has been analysed in terms of an impedance-like non-linear transfer function (TF). The equilibrium in a membrane was perturbed by application of a sinusoidal signal of concentrations of H, of large amplitude, to a surface. The fundamental harmonics of periodically reproducible flux at this surface is considered as the response. The TF is defined as the ratio of the signal to the response. The TF was used in determining the diffusion coefficient of H in α-phase Pd-H and Pd81Pt19-H, and their bulk elastic moduli.