Abstract
A new electrochemical termed as frequency response method, for the determination of the diffusion coefficient D in metal is proposed. In the bielectrode system, there appears a phase lag in th.e hydrogen permeation current, when the hydrogen charging constant current is overlapped with a sinusoidal current. The relation between the phase lag and the D value is given by solving the diffusion equation. Measurements were carried out for hydrogen and deuterium in the a-phase systems of Pd/H and Pd/D in the temperature range of 0° to 40°C, and the following values were obtained:
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