• Media type: E-Article
  • Title: Structure Analysis of Nanocrystalline MgO Aerogel Prepared by Sol-Gel Method
  • Contributor: Dercz, Grzegorz; Pająk, Lucjan; Prusik, Krystian; Pielaszek, Roman; Malinowski, Janusz J.; Pudło, Wojciech
  • imprint: Trans Tech Publications, Ltd., 2007
  • Published in: Solid State Phenomena
  • Language: Not determined
  • DOI: 10.4028/www.scientific.net/ssp.130.203
  • ISSN: 1662-9779
  • Keywords: Condensed Matter Physics ; General Materials Science ; Atomic and Molecular Physics, and Optics
  • Origination:
  • Footnote:
  • Description: <jats:p>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 &lt;R&gt; 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.</jats:p>