Structure of nanocrystalline powders of MgO prepared by sol-gel method

Grzegorz Dercz 1Pająk Lucjan 1Krystian Prusik 1Roman Pielaszek 2Janusz J. Malinowski 3

1. University of Silesia, Institute of Material Science, Bankowa 12, Katowice 40-007, Poland
2. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
3. Institute of Chemical Engineering Polish Academy of Sciences, Bałtycka 5, Gliwice 44-100, Poland

Abstract

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.

 

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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