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DS: Fachverband Dünne Schichten

DS 8: Optical Analysis of Thin Films I

DS 8.4: Vortrag

Mittwoch, 19. März 2025, 12:45–13:00, H3

Watching hydrogen diffusion into Lutetium and Yttrium thin films with Pd cap layers — •Zahra Hojjati, Philipp Flad, and Harald Giessen — 4. Physikalisches Institut, Universität Stuttgart

Hydrogenated Lutetium is one of the materials that may have a potential to be used as high-temperature superconductor under high pressure. Recently, reports have indicated that the Lu-H-N system undergoes a phase transition to blue when hydrogenated, with unconfirmed reports suggesting superconductivity. Therefore, we investigate hydrogen-lutetium interactions and the dynamics of hydrogen diffusion within lutetium, which is influenced by the ambient temperature, crystal structure and the hydrogen concentration. Hydrogen diffusion in metals involves interstitial diffusion through the lattice and surface absorption. We find that lutetium is a good hydrogen storage material due to its diffusion properties.

We analyzed the progression of the blue hydrogenation front in Lutetium and subsequently measured the drift velocity for each sample. We calculated the activation energy required for protons to overcome the potential barrier using the Arrhenius equation. Following this, we determined the diffusion constant based on the diffusion equation. We also carry out the same experiments with Yttrium.

Keywords: Hydrogen diffusion; Lutetium-Palladium; Diffusion speed; Drift velocity; Yttrium