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RESEARCH PRODUCT

Investigation of diffusion and electromigration of hydrogen in palladium and PdAg alloy

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Abstract Diffusion and electromigration of hydrogen in PdH 0.1 , Pd 77 Ag 23 H 0.1 and Pd 50 Ag 50 H 0.1 alloy were measured by means of resistivity method. It is known that hydrogen migrates towards the cathode within the temperature range of 300–473 K in the PdH 0.1 and Pd 77 Ag 23 H 0.1 system. In Pd 50 Ag 50 H 0.1 , hydrogen migrates towards the cathode below 400 K, but towards the anode at higher temperatures. Its effective valency increases together with temperature. At the same time it satisfies the linear dependence on inverse specific resistance ρ : Z eff = Z i +( k / ρ ). The constants Z i and k have the following values: (1.05±0.01) and −(3.81±0.04)×10 −8 Ω m for hydrogen in PdH 0.1 , (0.73±0.01) and −(11,82±0.03)×10 −8 Ω m for hydrogen in Pd 77 Ag 23 H 0.1 , and (0.79±0.04) and −(29.4±1.4)×10 −8 Ω m for hydrogen in Pd 50 Ag 50 H 0.1 , respectively. The activation energies of hydrogen diffusion amount to (0.23±0.001) eV/at. for PdH 0.1 , (0.221±0.006) eV/at. for Pd 77 Ag 23 H 0.1 and (0.31±0.02) eV/at. for Pd 50 Ag 50 H 0.1 alloys, respectively.