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Properties of cerium–zirconium mixed oxides partially substituted by neodymium: Comparison with Zr–Ce–Pr–O ternary oxides
- Source :
-
Journal of Solid State Chemistry . Aug2006, Vol. 179 Issue 8, p2511-2520. 10p. - Publication Year :
- 2006
-
Abstract
- Abstract: CeO2 doped with praseodymium, neodymium and/or zirconium atoms were prepared by coprecipitation and by the sol–gel method. Structural properties were investigated by in situ XRD and Raman spectroscopy while oxygen storage capacity (OSC) was measured by transient CO oxidation. All the compounds, except pure Nd2O3, have a fluorite-type structure as well as a Raman band at 560cm−1 characteristic of the oxygen vacancies involving non-stoichiometric oxides. The lattice parameter under hydrogen, being dependent on the temperature, revealed two reduction mechanisms: one at a low temperature at the surface and another at a high temperature in the bulk. Ce–Nd binary oxides show a strong tendency towards crystallite aggregation, which reduces accessibility to gases and OSC properties. Zirconium improves the thermal resistance to sintering of both Ce–Nd and Ce–Pr oxides. The Zr–Ce–Pr–O followed by Zr–Ce–Nd–O compounds displaying high oxygen mobility at a low temperature, appear to be very promising for practical applications such as OSC materials. [Copyright &y& Elsevier]
- Subjects :
- *PROPERTIES of matter
*CERIUM
*OXIDES
*NEODYMIUM
Subjects
Details
- Language :
- English
- ISSN :
- 00224596
- Volume :
- 179
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Solid State Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 21775955
- Full Text :
- https://doi.org/10.1016/j.jssc.2006.04.051