Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1579649 | Materials Science and Engineering: A | 2010 | 6 Pages |
Abstract
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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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
P. Scardi, M. Leoni, M. Müller, R. Di Maggio,