Water adsorption at the surface of pure and Gd-doped ceria

Anna Kossoy, Hagai Cohen, Tatyana Bendikov, Ellen Wachtel, Igor Lubomirsky

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The presence of water at the surface of sputtered thin films of Ce 0.8Gd0.2O1.9, which display elastic anomalies as a function of thermal treatment, and of stoichiometric CeO2 films, which do not, was monitored using X-ray photoelectron spectroscopy. We find that considerably more water is strongly bound at the surface of the Ce 0.8Gd0.2O1.9 films than of the CeO2 films. This supports the theoretical prediction that water binds preferentially at the oxygen vacancy sites. In addition, all films were treated according to the protocol which has been shown to produce inelastic behavior in the doped films: annealed at 500 °C, exposed to ambient atmosphere for one month and then heated to 250 °C in ultra-high vacuum. Neither the Ce 0.8Gd0.2O1.9 nor the CeO2 films show any change in the amount of adsorbed water. We therefore conclude that changes in the amount of surface adsorbed water do not play a role in the elastic anomalies observed as a function of thermal treatment of Ce0.8Gd 0.2O1.9 films.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalSolid State Ionics
Volume194
Issue number1
DOIs
Publication statusPublished - Jul 14 2011

Fingerprint

Cerium compounds
Adsorption
adsorption
Water
water
Heat treatment
anomalies
Ultrahigh vacuum
Oxygen vacancies
Surface waters
ultrahigh vacuum
X ray photoelectron spectroscopy
photoelectron spectroscopy
atmospheres
Thin films
oxygen
thin films
predictions
x rays

Keywords

  • Ceria
  • Chemical strain effect
  • Gadolinium doped ceria
  • Water incorporation
  • X-ray photoelectron- spectroscopy (XPS)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Chemistry(all)

Cite this

Water adsorption at the surface of pure and Gd-doped ceria. / Kossoy, Anna; Cohen, Hagai; Bendikov, Tatyana; Wachtel, Ellen; Lubomirsky, Igor.

In: Solid State Ionics, Vol. 194, No. 1, 14.07.2011, p. 1-4.

Research output: Contribution to journalArticle

Kossoy, Anna ; Cohen, Hagai ; Bendikov, Tatyana ; Wachtel, Ellen ; Lubomirsky, Igor. / Water adsorption at the surface of pure and Gd-doped ceria. In: Solid State Ionics. 2011 ; Vol. 194, No. 1. pp. 1-4.
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