TY - JOUR AU - Morelle, Fabrice AU - Jepsen, Lars Haahr AU - Jensen, Torben R. AU - Sharma, Manish AU - Hagemann, Hans AU - Filinchuk, Yaroslav TI - Reaction Pathways in Ca(BH4)2-NaNH2 and Mg(BH4)2-NaNH2 Hydrogen-rich Systems PY - 2016 JF - The Journal of Physical Chemistry C JA - The J. Phys. Chem. C SN - 1932-7447 VL - 120 IS - 16 SP - 8428 EP - 8435 L1 - http://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.6b00209 L3 - http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b00209 L4 - http://www.unige.ch/sciences/chifi/publis/pics/double/ref01512.png M3 - 10.1021/acs.jpcc.6b00209 UR - http://dx.doi.org/10.1021/acs.jpcc.6b00209 N2 - Two reactive hydride composite systems, Ca(BH4)2–NaNH2 and Mg(BH4)2–NaNH2, were systematically studied by in situ synchrotron radiation powder diffraction, in situ Fourier transform infrared spectroscopy, thermogravimetric analysis and differential scanning calorimetry coupled with mass spectrometry. Metathesis reactions between the amides and borohydrides take place in both systems between 100°C and 150°C yielding amorphous materials with the proposed composition M(BH4)(NH2). Simultaneously, a fraction of NaNH2 decomposes to Na3N and ammonia via a complex pathway. The main gas released under 300°C is ammonia for both systems, while significant amounts of hydrogen are released only above 350°C. ID - 1512 ER -