Influence of point-defect reaction kinetics on the lattice parameter of Ce0.8Gd0.2O1.9

Anna Kossoy, Yishai Feldman, Roman Korobko, Ellen Wachtel, Igor Lubomirsky, Joachim Maier

Research output: Contribution to journalArticle

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Abstract

The kinetics of point-defect association/dissociation reactions in Ce 0.8Cd0.2O1.9 and their influence on the crystal lattice parameter are investigated by monitoring thermally induced stress and strain in substrate and self-supported thin films. It is found that, in the temperature range of 100-180 °C, the lattice parameter of the substrate-supported films and the lateral dimensions of annealed, self-supported films both exhibit a hysteretic behavior consistent with dissociation/ association of oxygen vacancy-aliovalent dopant complexes. This leads to strong deviation from linear elastic behavior, denoted in the authors' previous work as the "chemical strain" effect. At room temperature, the equilibrium state of the point defects is reached within a few months. During this period, the lattice parameter of the substrate-supported films spontaneously increases, while the self-supported films are observed to transform from the flat to the buckled state, indicating that formation of the dopant-vacancy complex is associated with a volume increase. The unexpectedly slow kinetics of establishing the defect equilibrium at room temperature can explain the fact that, depending on the sample history, the "observable" lattice parameters of Ce0.8Cd0.2O1.9, as reported in the literature, may differ from one another by a few tenths of a percent. These findings strongly suggest that the lattice parameter of the materials with a large concentration of interacting point defects is a strong function of time and material preparation route.

Original languageEnglish
Pages (from-to)634-641
Number of pages8
JournalAdvanced Functional Materials
Volume19
Issue number4
DOIs
Publication statusPublished - Feb 24 2009

Fingerprint

Point defects
Reaction kinetics
point defects
Lattice constants
lattice parameters
reaction kinetics
Substrates
Doping (additives)
Association reactions
dissociation
Kinetics
kinetics
room temperature
Oxygen vacancies
crystal lattices
Crystal lattices
Temperature
Vacancies
routes
histories

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Influence of point-defect reaction kinetics on the lattice parameter of Ce0.8Gd0.2O1.9 . / Kossoy, Anna; Feldman, Yishai; Korobko, Roman; Wachtel, Ellen; Lubomirsky, Igor; Maier, Joachim.

In: Advanced Functional Materials, Vol. 19, No. 4, 24.02.2009, p. 634-641.

Research output: Contribution to journalArticle

Kossoy, Anna ; Feldman, Yishai ; Korobko, Roman ; Wachtel, Ellen ; Lubomirsky, Igor ; Maier, Joachim. / Influence of point-defect reaction kinetics on the lattice parameter of Ce0.8Gd0.2O1.9 . In: Advanced Functional Materials. 2009 ; Vol. 19, No. 4. pp. 634-641.
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