Local structures and hydrogen dynamics in amorphous and nanostructured Mg-Ni-H systems as studied by ¹H and ²H nuclear magnetic resonance

¹H and ²H NMR spectra have been measured for amorphous MgNi-H(D) and nanostructured Mg₂Ni-D systems synthesized by reactive mechanical grinding. ¹H MAS NMR spectra indicate that the dominant phase in the amorphous MgNi-H system is an amorphous MgNi-H phase and that a small amount of an amorphous/disordered α-MgH_x phase is contained. Hydrogens are randomly distributed in the amorphous MgNi-H phase. ²H NMR spectra demonstrate that hydrogen motion is faster in the order of the nanostructured Mg₂Ni-H, the crystalline Mg₂NiH₄ and the amorphous MgNi-H systems.