Paper Title:
Structure Analysis of Nanocrystalline MgO Aerogel Prepared by Sol-Gel Method
  Abstract

Wet gel obtained by sol-gel technique was dried in supercritical CO2 to prepare hydrated form of magnesium oxide. Calcination at 723 K under vacuum yielded nanocrystalline MgO aerogel. 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. Specific surface area SBET was equal to 238 m2/g. X-ray pattern reveals the broadened diffraction lines of periclase, the only crystalline form of magnesium oxide. The gamma crystallite size distribution was determined using FW 5 4 / 5 1 M method proposed by R. Pielaszek. The obtained values of and σ (measure of polydispersity) of particle size parameters are equal to 6.5 nm and 1.8 nm, respectively, whereas the average crystallite size estimated by Williamson-Hall procedure was equal to 6.0 nm. The obtained at Rietveld refinement Rwp, and S fitting parameters equal to 6.62% and 1.77, respectively, seem to be satisfactory due to the nanosize of MgO crystallites and because of the presence of amorphous phase.

  Info
Periodical
Solid State Phenomena (Volume 130)
Edited by
Danuta Stróż & Małgorzata Karolus
Pages
203-206
DOI
10.4028/www.scientific.net/SSP.130.203
Citation
G. Dercz, L. Pająk, K. Prusik, R. Pielaszek, J. J. Malinowski, W. Pudło, "Structure Analysis of Nanocrystalline MgO Aerogel Prepared by Sol-Gel Method", Solid State Phenomena, Vol. 130, pp. 203-206, 2007
Online since
December 2007
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