281841.fig.001
Figure 1: XRD patterns of (a) Mg nanoparticles, (b) Ni nanoparticles, (c) Mg2NiH4 sample prepared from Mg and Ni nanoparticles at 623 K in 4 MPa hydrogen for 2 hours, and (d) Mg2Ni sample prepared after evacuation of Mg2NiH4.