Watching in situ the hydrogen diffusion dynamics in magnesium on the nanoscale
Julian Karst, Florian Sterl, Heiko Linnenbank, Thomas Weiß, Mario Hentschel, Harald Gießen
Abstract
phonon resonance is used to achieve unprecedented chemical specificity between the material states. Our results reveal that the hydride phase nucleates at grain boundaries, from where the hydrogenation progresses into the adjoining nanocrystallites. We measure a much faster nanoscopic hydride phase propagation in comparison to the macroscopic propagation dynamics. Our innovative method offers an engineering strategy to overcome the hitherto limited diffusion coefficients and has substantial impact on the further design, development, and analysis of switchable phase transition as well as hydrogen storage and generation materials.
Topics & Concepts
MagnesiumNanoscopic scaleIn situDiffusionDynamics (music)HydrogenChemical physicsScale (ratio)NanotechnologyMaterials scienceBiological systemChemistryPhysicsBiologyThermodynamicsMetallurgyOrganic chemistryAcousticsQuantum mechanicsMagnesium Alloys: Properties and ApplicationsHydrogen Storage and MaterialsMicrostructure and mechanical properties