281841.fig.002
Figure 2: XRD patterns of (a) Mg nanoparticles, (b) Cu nanoparticles, (c) Mg-Cu-H hydride sample prepared from Mg and Cu nanoparticles at 673 K in 4 MPa hydrogen for 9 hours, and (d) Mg2Cu sample prepared after evacuation of Mg-Cu-H hydride system.