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MM: Fachverband Metall- und Materialphysik
MM 44: Functional Materials II
MM 44.2: Vortrag
Freitag, 18. März 2011, 10:45–11:00, IFW A
Atom probe tomography analysis of deuterium distribution in V-Fe alloy film — •Ryota Gemma1, Talaat Al-Kassab2, Reiner Kirchheim1, and Astrid Pundt1 — 1Institut für Materialphysik, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany — 2Division of Physical Sci.& Eng., King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
In hydrogen-metal systems, investigation of hydriding properties in reduced dimension has been one of the important issues for materials development in the field of hydrogen storage and sensor applications. Atom Probe Tomography (APT) has opened up a new quantitative approach to demonstrate deuterium (D) distribution in metals. In our previous studies, it has been shown that analysis temperature in the APT analysis and oxygen-exposure of D-loaded specimen exert a major influence on D distribution. These impacts are related to diffusion behavior of D. A reliable analysis of D distribution can be achieved only in the case that the D-diffusion is suppressed. In this study, lateral and depth distribution of D in V-Fe alloy film was investigated by APT at 20 - 30 K. In the analysis of V-Fe5at% film of 10 nm-thickness deposited on a W substrate performed at 30 K, the film loaded with 0.2 Pa deuterium gas showed an average D concentration of 0.23(8) D/Metal, which was in good agreement with the expected concentration of 0.31 D/Metal. An enrichment of D near the V/W interface was observed regardless of analysis temperature, which is explained by the presence of D-trapping effect at misfit dislocations.