X-ray and electron microscopy techniques studies on nanocrystalline MgO powder materials 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

Materials with MgO nanocrystalites were prepared by sol-gel synthesis. Alcogels were dried either supercritically at 538 K or in supercritical CO2. Conventional drying was also applied. Calcination of dry gels at 723 K under vacuum yielded MgO nanocrystallites. In the studied materials the amorphous phase was also stated. MgO nanocrystallites are immersed in amorphous matrix. Structure studies were performed by X-ray diffraction, scanning and transmission electron microcopies. Nitrogen adsorption/desorption measurements were also performed. Morphology of supercritically dried samples is similar; rough surface of powder particles is observed. Powder particles of conventionally dried sample are more compact. Size of MgO crystallites is generally similar for all samples and equal to about 7 nm despite of drying conditions of alcogels. Specific surface area and volume of mesopores is the greatest for sample supercritically dried at 538 K.

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Presentation: Poster at 11th European Powder Diffraction Conference, Poster session, by Grzegorz Dercz
See On-line Journal of 11th European Powder Diffraction Conference

Submitted: 2008-04-30 21:40
Revised:   2009-06-07 00:48
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