Formation of Ni/NiO nanoparticles in Supermicroporous Silica-Based SiO2-Al2O3-NiO Materials: Structural and Magnetic Studies
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Microporous silica-based materials SiO2-Al2O 3-NiO with a predominant pore size in the range 8-20 Å, prepared by the sol-gel method by variation in Ni2+ concentrations from 0 to 30 weight %, have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy. The nature of the nickel centers has been studied by magnetic susceptibility measurements supported by the XPS and X-ray experiments. It has been shown that these centers represent NiO and Ni 0 (observed at high nickel loadings) aggregated into nanoparticles. The Ni0 nanoparticles are responsible for the room-temperature ferromagnetic behavior of the materials prepared with high nickel loadings, © 2008 IEEE.
author list (cited authors)
Bakhmutov, V. I., Shpeizer, B. G., Prosvirin, A. V., Dunbar, K. R., & Clearfield, A.