Fig. 2From: Fabrication and Characterization of Monodisperse Magnetic Porous Nickel Microspheres as Novel CatalystsWide-angle powder XRD patterns of porous NiO microspheres and Ni microspheres reduced at 300 °C, 400 °C, and 500 °C. The violet lines show the standard diffractions of Ni (JCPDS No. 04–0850)Back to article page