Among metal hydrides, magnesium hydride (MgH
2) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity (7.6 mass%). However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH
2 can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg
7TiH
16 (6.9 mass%) would release hydrogen at a lower temperature by 130 K than MgH
2. The Mg-H ionic bonding distance in Mg
7TiH
16 is longer than that in MgH
2. The observed lower dehydrogenation temperature seems to be consistent with the structure.
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