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Phase Segregation in Cerium−Lanthanum Solid Solutions

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Inorganic Chemistry and Catalysis, Department of Chemistry, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands, and Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay Cédex, France
Cite this: J. Phys. Chem. B 2006, 110, 20, 9984–9990
Publication Date (Web):May 3, 2006
Copyright © 2006 American Chemical Society

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    Electron energy-loss spectroscopy (EELS) in combination with scanning transmission electron microscopy (STEM) reveals that the La enrichment at the surface of cerium−lanthanum solid solutions is an averaged effect and that segregation occurs in a mixed oxide phase. This separation occurs within a crystalline particle, where the dopant-rich phase is located at the surface of the dopant-deficient phase. The limiting structure appears to be a solid solution with a La fraction of x = 0.6 in the bulk and x = 0.75 at the surface. Up to a La fraction of 0.6, this phase will coexist with a lanthanum-type structure in different proportions depending on the dopant amount. STEM-EELS appears to be a powerful technique to clarify the existence of a multiphase system, and it shows that XRF, XPS, and XRD measure averaged results and do not show the phase complexity of the solids.

     Utrecht University.

     Université Paris-Sud.


     Corresponding author. Phone:  +31 30 253 4328; fax:  +31 30 251 1027; e-mail:  [email protected].

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