Structural studies of complex hydrides

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Event details

Date and time 28.11.2016 11:0012:00  
Place and room
Zeuzier conference room, EPFL Valais
Speaker Bjørn C. Hauback, Physics Department, Institute for Energy Technology (IFE), Kjeller, Norway
Category Conferences - Seminars
Detailed knowledge about the positions of the atoms is of major importance both for development of new compounds and for understanding of their properties. Neutron diffraction is a unique tool for studies of metal hydrides since it is the only method to determine the positions of the hydrogen/deuterium atoms in the crystal structures. The use of deuterium is crucial due to the challenge with incoherent scattering with normal hydrogen (protium). For studies of boron-based compounds, borohydrides, the 11B isotope has to be used because of the strong absorption of neutrons in normal boron (mainly 10B). Most of our powder neutron diffraction (PND) experiments are performed with the high-resolution powder diffractometer PUS at the JEEP II reactor at IFE.

The combination of PND and X-ray diffraction is often important. In order to solve complicated structural features and to perform in-situ experiments, access to synchrotron radiation powder X-ray diffraction (SR-PXD) is crucial. SR-PXD is in particular important for detailed studies of crystalline phases during hydrogen absorption and desorption. Effects of additives are investigated by combined EXAFS/XANS and SR-PXD experiments. Our SR-PXD experiments are performed at the Swiss-Norwegian Beamlines (SNBL) at the ESRF, Grenoble, France.

Selected detailed structural studies and in-situ sorption diffraction experiments will be presented. The presentation will address recent studies of borohydrides and other complex hydrides. Selected examples of novel compounds, efforts to understand hydrogenation/dehydrogenation properties including effect of selected additives, will be described. The combination of neutron and synchrotron radiation X-ray scattering is in particular important and will be emphasized.
The Research Council of Norway, EU FP7 projects FLYHY, BOR4STORE and ECOSTORE are acknowledged for financial support.
 

Practical information

  • General public
  • Free

Organizer

  • Prof. Andreas Züttel

Contact

  • Constance Visser Witman Phone number: 021 695 83 04

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