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Title: Properties of cerium-zirconium mixed oxides partially substituted by neodymium: Comparison with Zr-Ce-Pr-O ternary oxides

CeO{sub 2} 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 Nd{sub 2}O{sub 3}, have a fluorite-type structure as well as a Raman band at 560 cm{sup -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. - Graphical abstract: Variation of oxygen vacancies under hydrogen on ternary oxides.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Laboratoire de Catalyse en Chimie Organique, UMR 6503, CNRS et Universite de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers (France)
  2. Laboratoire de Catalyse en Chimie Organique, UMR 6503, CNRS et Universite de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers (France). E-mail: Sylvie.rossignol@univ-poitiers.fr
Publication Date:
OSTI Identifier:
20905403
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 8; Other Information: DOI: 10.1016/j.jssc.2006.04.051; PII: S0022-4596(06)00239-8; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM OXIDES; COPRECIPITATION; DOPED MATERIALS; LATTICE PARAMETERS; NEODYMIUM OXIDES; PRASEODYMIUM OXIDES; RAMAN SPECTROSCOPY; SOL-GEL PROCESS; SYNTHESIS; VACANCIES; X-RAY DIFFRACTION; ZIRCONIUM OXIDES