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Structure of nanocrystalline powders of MgO prepared by sol-gel method
|Grzegorz Dercz 1, Pająk Lucjan 1, Krystian Prusik 1, Roman Pielaszek 2, Janusz J. Malinowski 3|
1. University of Silesia, Institute of Material Science, Bankowa 12, Katowice 40-007, Poland
Wet gels obtained by sol-gel method were dried at different conditions. Calcination at 723 K under vacuum yielded nanocrystalline MgO powder. Structure studies were performed by X-ray diffraction, scanning and transmission electron microcopies. Electron microscopy images reveal rough, unfolded and ramified structure of solid skeleton. X-ray patterns reveal the broadened diffraction lines of periclase, the only crystalline form of magnesium oxide. The gamma crystallite size distributions were determined using FW(1/5)/(4/5)M method proposed by R. Pielaszek. The obtained values of <R> and σ (measure of polydispersity) of particle size parameters are about to 7 nm and 2 nm, respectively, whereas the average crystallite size estimated by Williamson-Hall procedure was equal to 6.5 nm. The obtained at Rietveld refinement Rwp, and S fitting parameters are the order 7.0% and 1.8, respectively, seem to be satisfactory due to the nanosize of MgO crystallites and because of the presence of amorphous phase.
Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Grzegorz Dercz
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-14 12:07 Revised: 2009-06-07 00:44