The Physicochemical Aspect of Palladium Hydrogenation

The possibility of controlling the hydrogen content and storage in polycrystalline palladium has been elucidated by the internal-friction technique, in which the characteristics of local dissipative processes are analyzed to establish the interplay between the structural changes in a system during hydrogenation and dilution of a metal. The growth of the modulus of the @  solid solution up to the palladium modulus value has been explained by a decrease in the lattice constant due to the release of hydrogen atoms from it. The internal-friction method has also been used to analyze the dissipative processes in cadmium and copper in order to evaluate the possibility of their use for modifying the palladium surface to prevent desorption of hydrogen atoms from the 
–air interface. Spectral analysis has disclosed the possibility of violation of the adhesive contact of their surface layers and the palladium matrix upon variation in the temperature and frequency conditions, which points the way toward further use of the high-temperature polymer systems as blocking coatings.