Diffusion filtering metallic palladium–yttrium membranes are subjected to hydrogenation from a gas phase and are studied by X-ray diffraction using synchrotron radiation. Boundaries of the formation of hydrogen-enriched phases are improved for a range of alloying component content, which is critical for their formation. The effect of the initial state of the alloy on conditions of hydride phase formation in the system is demonstrated. The content of hydrogen occluded in the membrane structure and hydrogen-induced lattice dilatations are determined. The parameters of the alloy substructure are calculated.

—The metallic filter foils of palladium-yttrium alloys are studied using X-ray diffraction analysis. The aim of the research is to study the high-temperature effects on phase transformations...

The processes of relaxation of the structure, phase composition, and surface topology of the diffusion membrane filters of Pd_0.93Y_0.07 alloy after hydrogenation are comprehensively studied. The difference in the development of defects as a result of their interaction with absorbed hydrogen is shown. The relaxation processes are investigated for the following two cases: the formation of a hydrogen-rich β phase in a membrane during hydrogenation and the presence of an immiscibility region between the dilute solid solution of hydrogen (α phase) and the hydride β phase in the metal alloy. A comparative analysis of changes in the effective size of coherent-scattering regions and microscopic deformations in them at the initial stage of hydrogen retention in the structure of the palladium-based alloy is given. The study of the relaxation features of diffusion filters after hydrogenation reveals significant phase transformations and changes in the substructure parameters of Pd–Y–H systems.

An X-ray diffraction procedure is proposed for modeling the distribution of components in the depth of an alloy by analyzing the integral intensity, shape, and width of diffraction peaks of two orders of reflection. The procedure is used to refine data on the phase composition and distribution of indium atoms in the depth of hydrogenised Pd-In-Ru alloy after its long-term relaxation.

The evolution of a nanostructured state of palladium—lead membrane alloys during their interaction with hydrogen was studied using precision X-ray diffraction with synchrotron radiation (SR) and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDXS). The importance of this topic is due to the need and demand for improving the performance characteristics of dense metal diffusion filters for high purity hydrogen separation processes. Palladium-based membrane filters with lead concentrations of 5 and 20 wt.% were prepared via electric arc melting from high purity metals (99.95%). The thickness of the filters was 50 μm. Hydrogenation was carried out from a gas medium at 573 K and the pressure of 16 atm. within 150 min. The focus of the study is on the structural state of diffusion filter membranes depending on the content of the palladium-alloying element—lead—and on analysis of the substructure of alloys before and 5300 h relaxation after hydrogenation is carried out. Specific features of the surface morphology and the structure of the membrane filters depending on the concentration of lead in the alloys are determined. The formation and development of deformation processes in metal systems upon the hydrogenation is shown. The establishment of peculiarities of hydrogen interaction with metals will contribute to obtaining new potentially important characteristics of membrane filters.