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MM: Fachverband Metall- und Materialphysik
MM 48: Topical session: X-ray and neutron scattering in materials science I - Coherent X-ray Diffraction Imaging of Excitations in Metal Nanoparticles
MM 48.3: Talk
Thursday, April 3, 2014, 10:45–11:00, BAR 205
Hydrogen desorption pathway of Mg(BH4)2 probed by in-situ X-ray Raman scattering — •Simon Kujawski1, Christian Sternemann1, Arndt Remhof2, Christoph Sahle3, Yigang Yan2, Nicholas Stadie2, Kolja Mende1, Ali Al Zein4, and Metin Tolan1 — 1Fakultät Physik/Dortmund Electron Accelerator, Technische Universität Dortmund, 44221 Dortmund, Germany — 2EMPA, Swiss Federal Laboratories for Materials Science and Technology, Hydrogen & Energy, 8600 Dübendorf, Switzerland — 3Department of Physics, University of Helsinki, Fi-00014, Helsinki, Finland — 4European Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France
With a hydrogen density of 14.9 wt% the complex hydride Mg(BH4)2 is considered as a solid-state hydrogen storage material. Identifying the amorphous boron-containing species during the desorption process provides essential information about the decomposition pathway of Mg(BH4)2. Unlike diffraction, X-ray Raman scattering allows investigating the local atomic and electronic structure and hence quantitatively estimating the amounts of different amorphous constituents. By modelling the X-ray Raman spectra from the possible constituents we unveiled the reaction pathway and determined the role of boron within.