aHydrogen desorption properties and decomposition processes of NH 3 BH 3 -MAlH 4 (M = Na, Li) composites were investigated by using thermogravimetry-differential thermal analysis (TG-DTA-MS), powder X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. We prepared the composites by ball-milling and the mixtures by hand-milling. The ball-milled composites desorbed 4-5 wt% hydrogen at three exothermic steps below 260 °C. The emissions of by-product gases, NH 3 , B 2 H 6 and B 3 H 6 N 3 , were effectively suppressed. From XRD and FTIR analyses, the formation of mixed-metal (Na(Li), Al) amidoborane phase was suggested. Very different results were obtained using hand-milling. They showed only one exothermic reaction at 80-90 °C. The emission of by-product gases was not suppressed. By comparing the differences between ball-milled composites and hand-milled mixtures, the importance of mixed-metal amidoborane in this system was proposed.
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