The effect of microstructure on the hydrogenation of Mg/Fe thin film multilayers

摘要: Nanoconfined magnesium hydride can be simultaneously protected and thermodynamically destabilized when interfaced with materials such as Ti Fe. We study the hydrogenation of thin layers Mg (<14 nm) nanoconfined in one dimension within film Fe/Mg/Fe/Pd multilayers by optical technique Hydrogenography. The nanosized Fe/Mg/Fe surprisingly shows presence multiple plateau pressures, whose nature is thickness dependent. In contrast, hydrogen desorption occurs via a single which does not depend on layer thickness. From structural morphological analyses X-ray diffraction/reflectometry cross-section TEM, we find that roughness large deposited Fe furthermore contains high-angle grain boundaries (GB's). When grown Ti, low no GB's are detected. Ti/Mg/Fe multilayer, flat has little or GB's, conclude MgH2 indeed interface this case, both ab- pressures increased factor two compared to Ti/Mg/Ti multilayers. hypothesize multilayer act diffusion pathways for Pd, known greatly alter behavior share an interface.