Dislocations and crystallite size distribution in nanocrystalline CeO2 obtained from an ammonium cerium(IV)-nitrate solution

T. Ungár, I. Dragomir-Cernatescu, D. Louër, N. Audebrand

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Nanocrystalline CeO2 powder has been obtained by thermal decomposition of hydrated ceria prepared from a solution of ammonium cerium(IV) nitrate. Thermal treatments up to 700°C were applied in order to reduce microstrains without substantial increase of grain growth. Crystallite size and size-distribution has been determined by X-ray diffraction profile analysis. The Williamson-Hall plots of the FWHM have revealed pronounced strain anisotropy which has been treated and rationalised in terms of the dislocation model of the mean square strain in the modified Williamson-Hall plots. The dislocation densities were obtained from the modified Warren-Averbach method. A strong decrease of the dislocation density and a slight increase of the crystallite size is observed with increasing annealing temperature.

Original languageEnglish
Pages (from-to)1935-1941
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume62
Issue number11
Publication statusPublished - Nov 2001

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Cerium
Crystallite size
cerium
nitrates
Nitrates
Nanocrystalline powders
Cerium compounds
Full width at half maximum
plots
Grain growth
X ray diffraction analysis
Anisotropy
Pyrolysis
Heat treatment
Annealing
thermal decomposition
anisotropy
annealing
profiles
diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Dislocations and crystallite size distribution in nanocrystalline CeO2 obtained from an ammonium cerium(IV)-nitrate solution. / Ungár, T.; Dragomir-Cernatescu, I.; Louër, D.; Audebrand, N.

In: Journal of Physics and Chemistry of Solids, Vol. 62, No. 11, 11.2001, p. 1935-1941.

Research output: Contribution to journalArticle

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