Abstract
The hydrogen permeability and diffusivity in a laminate sample consisting of Pd overlayer, sputter-deposited FeTi0.96 film and Pd plate have been determined in the temperature range 473 to 773 K. The hydrogen diffusion coefficient in FeTi0.96 film was calculated using the proposed permeation theory for bilayer composites. The FeTi0.96 film was amorphous up to 723 K. The effective hydrogen diffusion coefficient in the laminate sample containing the amorphous FeTi0.96 film was nearly equal to that of Pd, consequently it was impossible to estimate the hydrogen diffusion coefficient in amorphous FeTi0.96 film. The hydrogen permeability and diffusivity in the laminate sample markedly decreased after the crystallization of FeTi0.96 film. The calculated hydrogen diffusion coefficient in crystalline FeTi0.96 film showed a small temperature dependence. It was explained in terms of the short circuit diffusion through defects such as grain boundaries which were generated during the crystallization process.
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