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Ex-oxalate magnesium oxide, a strain-free nanopowder studied with diffraction line profile analysis

Published online by Cambridge University Press:  01 March 2012

Nathalie Audebrand ,
Christine Bourgel  and
Daniel Louër
Nathalie Audebrand
Affiliation:
Sciences Chimiques de Rennes (UMR CNRS 6226), Institut de Chimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
Christine Bourgel
Affiliation:
Sciences Chimiques de Rennes (UMR CNRS 6226), Institut de Chimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
Daniel Louër
Affiliation:
Sciences Chimiques de Rennes (UMR CNRS 6226), Institut de Chimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
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Abstract

An analysis of the microstructure of nanocrystalline magnesium oxide produced by thermal decomposition of magnesium oxalate, in the temperature range 500 °C–1200 °C, is described. The study is based on diffraction line broadening analysis carried out with the integral breadth (Langford) and Fourier methods, combined with the pattern decomposition technique. Additionally, the whole pattern matching method is also applied. No marked line broadening anisotropy is observed in the patterns. It is shown that the nanopowders are characterized by minimal strain and that crystallites have an average spherical shape. Volume-weighted and area-weighted apparent sizes are in the ranges 98–480 Å and 72–282 Å, respectively, within the temperature range considered. The results obtained from line broadening analysis are compared to those observed with scanning electron microscopy and surface area measurements. A satisfactory agreement is found between sizes derived from the different techniques.

Keywords

diffraction line broadening analysisnanocrystalline magnesium oxidestrain-free magnesium oxideex-oxalate MgOintegral breadth method

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Type
Technical Articles
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Powder Diffraction , Volume 21 , Issue 3 , September 2006 , pp. 190 - 199
Copyright
Copyright © Cambridge University Press 2006

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