Using light transmission to watch hydrogen diffuse

Abstract

Because of its light weight and small size, hydrogen exhibits one of the fastest diffusion rates in solid materials, comparable to the diffusion rate of liquid water molecules at room temperature. The diffusion rate is determined by an intricate combination of quantum effects and dynamic interplay with the displacement of host atoms that is still only partially understood. Here we present direct observations of the spatial and temporal changes in the diffusion-induced concentration profiles in a vanadium single crystal and we show that the results represent the experimental counterpart of the full time and spatial solution of Fick's diffusion equation. We validate the approach by determining the diffusion rate of hydrogen in a single crystal vanadium (001) film, with net diffusion in the [110] direction.

An Innovative Procedure to Evaluate the Hydrogen Diffusion Coefficient in Metals from Absorption Measurements

“…More recent techniques also relies on the use of light transmission to monitor the concentration of hydrogen as a function of both the position and time [15][16][17]. Another route to assess the diffusion coefficient is by performing permeation experiments.…”

Critical hydrogenation effect on magnetic coercivity of perpendicularly magnetized Co/Pd multilayer nanostructures

“…[2][3][4] Based on this concept, various hydrogenated metallic films have been considered as functional materials for hydrogen sensing and real-time monitoring of hydrogen diffusion. [4][5][6][7][8][9] Palladium (Pd) has long been used as a highly efficient catalyst for hydrogen dissociation and absorption. 4,[10][11][12][13][14][15] Thin Pd films with a thickness of a few nanometers are widely used in metal-hydride systems.…”

Hydrogen-mediated long-range magnetic ordering in Pd-rich alloy film

“…[15][16][17][18] Based on these findings, we expected to observe appreciable magnetic modulation in Pd-rich magnetic alloy thin film; such materials would be useful for fabricating gas sensors. [19][20][21] Thus, in this study, the effect of hydrogenation on the magnetic properties of Co 14 Pd 86 was investigated. Reversible and appreciable modulation of the magnetism was demonstrated and analyzed for discussion.…”