In situ size-strain analysis of nanocrystalline ceria growth

A xerogel produced from cerium isopropoxide is shown to be made of nanocrystalline ceria domains (ca. 2 nm in diameter), already formed by condensation of the hydrolysed precursor. In situ isothermal X-ray diffraction studies of the xerogel calcination reveal the occurrence of a second stage of nucl...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 1; pp. 77 - 82
Main Authors Scardi, P., Leoni, M., Müller, M., Di Maggio, R.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.11.2010
Subjects
Asymptotic properties
Ceria nanocrystals
Cerium
Cerium oxide
Coalescing
Diffraction
Growth kinetics
Line profile analysis
Materials science
Nanocrystalline materials
Nanocrystals
Nucleation
Precursors
Structural materials
X-ray diffraction
Xerogels
Line profile analysis
X-ray diffraction
Nanocrystalline materials
Growth kinetics
Ceria nanocrystals
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Summary:A xerogel produced from cerium isopropoxide is shown to be made of nanocrystalline ceria domains (ca. 2 nm in diameter), already formed by condensation of the hydrolysed precursor. In situ isothermal X-ray diffraction studies of the xerogel calcination reveal the occurrence of a second stage of nucleation, followed by growth of the grains up to a temperature-dependent asymptotic limit. The process, with an activation energy of 52(4) kJ/mol and an Avrami exponent 0.55–0.75, is interpreted in terms of coalescence of the existing nuclei.
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ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2010.03.077