Real-time study of the deuteration of reactive hydride composites in the Li-Mg-N-D system (Li3N-MgD2)
In situ neutron powder diffraction shall be performed on potential hydrogen storage materials in the system Li-Mg-N-D. The mixture Li3N+MgD2 yields LiND2+MgD2 by heating under deuterium gas. The desorption yielding mixtures of magnesium nitride, lithium magnesium nitride and lithium deuteride, and the redeuteration of this mixture follows different pathways, depending on the deuterium gas pressure. These reactions will be investigated by using a sapphire single crystal based gas pressure cell on D20 with a time resolution of 1 minute in two experiment: At a deuterium pressure of 1 bar, Li3N+MgD2 will be deuterated at 500 K, the reaction product dedeuterated at 700 K under argon as protective gas and then redeuterated at 500 K. The same experimental protocol will be followed for a deuterium gas pressure of 10 bar. These in situ investigations will reveal the different reaction pathways and help understanding reversibility of hydrogenation-dehydrogenation cycles in this system. To allow for an accurate temperature measurement and the best possible instrumental setting, new temperature calibration and testing of the sapphire crystals by omega scans will be performed beforehand.
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Holger Kohlmann; AUER Henry; BEHRENDT Gereon; GOETZE André and Thomas C. Hansen. (2014). Real-time study of the deuteration of reactive hydride composites in the Li-Mg-N-D system (Li3N-MgD2). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-25-235
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