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Proton Dynamics in Palladium-Silver: An Inelastic Neutron Scattering Investigation.

Daniele Colognesi1, Franz Demmel2, Alessandra Filabozzi3

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Summary
This summary is machine-generated.

Proton dynamics in palladium-silver (Pd-Ag) membranes were studied using neutron spectroscopy. The research found that macroscopic diffusion is governed by microscopic jump diffusion, providing insights into hydrogen behavior in these materials.

Keywords:
hydrogen diffusioninelastic neutron scatteringpalladium/silver membranes

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Palladium-silver (Pd-Ag) alloys are crucial for hydrogen separation and storage.
  • Understanding proton dynamics in these membranes is essential for optimizing their performance.

Purpose of the Study:

  • To investigate proton dynamics in Pd77Ag23 membranes.
  • To elucidate the relationship between microscopic and macroscopic diffusion processes.
  • To determine the vibrational density of states of hydrogen in the Pd-Ag lattice.

Main Methods:

  • Utilized multiple neutron spectroscopic techniques: Quasi-Elastic Neutron Scattering (QENS), Incoherent Inelastic Neutron Scattering (IINS), Neutron Transmission, and Deep Inelastic Neutron Scattering (DINS).
  • Conducted experiments at the ISIS spallation neutron source using OSIRIS, MARI, and VESUVIO spectrometers.
  • Performed measurements across a range of pressures (1-4 bar) and temperatures (330-673 K), probing time scales from 10^-4 to 10^2 ps.

Main Results:

  • Confirmed that macroscopic proton diffusion in Pd77Ag23 membranes is controlled by microscopic jump diffusion.
  • Determined the vibrational density of states (VDOS) for hydrogen atoms within the metal lattice at various concentrations and temperatures.
  • Complemented previous neutron diffraction studies, offering a comprehensive view of structural and dynamical properties.

Conclusions:

  • Microscopic jump diffusion is the dominant mechanism governing proton transport in Pd-Ag membranes.
  • Neutron spectroscopy provides detailed insights into the dynamic behavior of hydrogen in metallic systems.
  • The combined structural and dynamical data enhance the understanding of H-loaded Pd-Ag membranes for technological applications.