Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 30: Instrumentation VIII
HK 30.5: Talk
Tuesday, March 15, 2016, 17:45–18:00, S1/01 A3
Quantitative detection of microscopic lithium distributions with neutrons — •Giulia Neri1, Roman Gernhäuser1, Josef Lichtinger1, Sonja Winkler1, Dominik Seiler1, Michael Bendel1, Julia Kunze-Liebhäuser2, Jassen Brumbarov2, Engelbert Portenkirchner2, Axel Renno3, and Georg Rugel3 — 1Technische Universität München, Physik-Department, Germany — 2Institut für Physikalische Chemie, Leopold-Franzens-Universität Innsbruck, Austria — 3Helmholtz Zentrum Dresden Rossendorf, Helmholtz-Institut Freiberg für Ressourcentechnologie, Germany
The importance of lithium in the modern industrial society is continuously increasing. Spatially resolved detection of tritium particles from 6Li(n,α)3H nuclear reactions is used to reconstruct microscopic lithium distributions. Samples are exposed to a flux of cold neutrons. Emitted charged particles are detected with a PSD. Introducing a pinhole aperture between target and detector, the experimental setup works like a “camera obscura”, allowing to perform spatially resolved measurements. Tritium detection analysis was successfully used to reconstruct the lithium content in self-organized TiO2−x-C and Si/TiO2−x-C nanotubes electrochemically lithiated, for the first time. Titanium dioxide nanotubes are a candidate for a safe anode material in lithium-ion batteries. Also lithium distributions in geological samples, so called “pathfinder-minerals” containing lithium, like lepidolite from a pegmatite, were analyzed. With this development we present a new precision method using nuclear physics for material science.
Supported by the DFG (GE 2296/1-1).