CeK-edge EXAFS study of nanocrystalline CeO2
Journal
Materials Research Bulletin
Journal Volume
37
Journal Issue
3
Pages
555-562
Date Issued
2002
Author(s)
Abstract
Nanocrystalline CeO2 samples were prepared via precipitation from aqueous cerium(IV) sulfate solution under a controlled pH. After being subjected to calcination at various temperatures to yield different particle sizes, the local structure around Ce atom was investigated by using EXAFS spectroscopy at Ce K-edge. The first shell Ce-O distance was found to be slightly shorter with small CeO2 particles, indicating a contraction of the lattice. There exists a significant growth in coordination number of the second cell Ce-Ce when the particle size became larger. In terms of Debye-Waller factor (σ2), the first three coordination shells showed a consistent trend, i.e. the degree of disorder increases with reduced particle size. Moreover, σ2 of the second shell was found to be smaller than that of the first shell for all samples. © 2002 Elsevier Science Ltd. All rights reserved.
SDGs
Type
journal article