Structure of Ultrathin CeO2 Films on Pt(111) by Polarization-Dependent X-ray Absorption Fine Structure (Articolo in rivista)

Type
Label
  • Structure of Ultrathin CeO2 Films on Pt(111) by Polarization-Dependent X-ray Absorption Fine Structure (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp310375t (literal)
Alternative label
  • P. Luches, F. Pagliuca, S. Valeri and F. Boscherini (2013)
    Structure of Ultrathin CeO2 Films on Pt(111) by Polarization-Dependent X-ray Absorption Fine Structure
    in Journal of physical chemistry. C; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • P. Luches, F. Pagliuca, S. Valeri and F. Boscherini (literal)
Pagina inizio
  • 1030 (literal)
Pagina fine
  • 1036 (literal)
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  • 117 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • + Centro S3, Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, Via G. Campi 213/a, I-41125 Modena, Italy ? Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Via G. Campi 213/a, I-41125 Modena, Italy § Dipartimento di Fisica e Astronomia, Università di Bologna, Viale C. Berti-Pichat 6/2, I-40127 Bologna, Italy Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, Operative Group in Grenoble, c/o ESRF, BP 220, F-38043 Grenoble, France (literal)
Titolo
  • Structure of Ultrathin CeO2 Films on Pt(111) by Polarization-Dependent X-ray Absorption Fine Structure (literal)
Abstract
  • We present a study of the structure of cerium oxide ultrathin films supported on Pt(111), focused on the evolution of the epitaxial strain in films of different thickness. The stoichiometry and oxidation state of the films are determined by X-ray photoemission spectroscopy, and the surface structure, measured by low-energy electron diffraction, is compared with the results obtained by the analysis of X-ray absorption fine structure measurements at the Ce L3 edge, exploiting the polarization dependence of the cross section to probe the in-plane and the out-of-plane atomic correlations. The obtained results allow to establish the epitaxial relation between the cerium oxide film and the Pt substrate and give an accurate evaluation of the cerium oxide layer structure. The 2 ML films have a fluorite structure which is compressed in the (111) plane. The measured compression is compatible with the assumption of a coincidence lattice between overlayer and substrate, in which three CeO2 surface unit cells match four Pt unit cells. The films' three-dimensional structure is compared with the one expected assuming the bulk-phase elastic constants. The strain is released when the film thickness is increased to 10 ML, and the lattice parameters assume the bulk values. (literal)
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