The origin of elastic anomalies in thin films of oxygen deficient ceria, CeO2 - X

Anna Kossoy, Anatoly I. Frenkel, Yishay Feldman, Ellen Wachtel, Alla Milner, Igor Lubomirsky

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Self-supported films of CeO1.95 display time-scale dependent elastic moduli, a phenomenon which has been termed the chemical strain effect. In order to probe the possible structural origins of this behavior, extended X-ray absorption fine structure spectroscopy and X-ray diffraction were used. Evidence was found that, although this oxygen deficient ceria appears to maintain the fluorite structure on average, the mean Ce-O bond length is shorter than the mean Ce-oxygen vacancy distance. This finding is consistent with crystallographic data from more strongly reduced ceria in which the oxygen vacancies are ordered. By studying strain induced structural changes, we show that it is possible to relate this lattice distortion to the chemical strain effect. Similar conclusions were previously reached for films of Ce 0.8Gd0.2O1.9. Since the ionic radii of both Gd3+ and Ce3+ are larger than that of Ce4+, we suggest that when cation dopants are larger than the host, ceria compounds containing a high concentration of oxygen vacancies may exhibit elastic anomalies.

Original languageEnglish
Pages (from-to)1473-1477
Number of pages5
JournalSolid State Ionics
Volume181
Issue number33-34
DOIs
Publication statusPublished - Oct 25 2010

Fingerprint

Cerium compounds
Oxygen vacancies
anomalies
Oxygen
Thin films
oxygen
thin films
Extended X ray absorption fine structure spectroscopy
Fluorspar
Bond length
Cations
fluorite
Elastic moduli
Positive ions
Doping (additives)
X ray diffraction
modulus of elasticity
x rays
fine structure
cations

Keywords

  • Chemical strain
  • Elasticity
  • Extended X-ray absorption fine structure spectroscopy (EXAFS)
  • Gadolinium-doped ceria
  • Thermal expansion

ASJC Scopus subject areas

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

Cite this

The origin of elastic anomalies in thin films of oxygen deficient ceria, CeO2 - X . / Kossoy, Anna; Frenkel, Anatoly I.; Feldman, Yishay; Wachtel, Ellen; Milner, Alla; Lubomirsky, Igor.

In: Solid State Ionics, Vol. 181, No. 33-34, 25.10.2010, p. 1473-1477.

Research output: Contribution to journalArticle

Kossoy, A, Frenkel, AI, Feldman, Y, Wachtel, E, Milner, A & Lubomirsky, I 2010, 'The origin of elastic anomalies in thin films of oxygen deficient ceria, CeO2 - X ', Solid State Ionics, vol. 181, no. 33-34, pp. 1473-1477. https://doi.org/10.1016/j.ssi.2010.09.001
Kossoy, Anna ; Frenkel, Anatoly I. ; Feldman, Yishay ; Wachtel, Ellen ; Milner, Alla ; Lubomirsky, Igor. / The origin of elastic anomalies in thin films of oxygen deficient ceria, CeO2 - X . In: Solid State Ionics. 2010 ; Vol. 181, No. 33-34. pp. 1473-1477.
@article{dc952628cfc24cb7b040ed48c4fce987,
title = "The origin of elastic anomalies in thin films of oxygen deficient ceria, CeO2 - X",
abstract = "Self-supported films of CeO1.95 display time-scale dependent elastic moduli, a phenomenon which has been termed the chemical strain effect. In order to probe the possible structural origins of this behavior, extended X-ray absorption fine structure spectroscopy and X-ray diffraction were used. Evidence was found that, although this oxygen deficient ceria appears to maintain the fluorite structure on average, the mean Ce-O bond length is shorter than the mean Ce-oxygen vacancy distance. This finding is consistent with crystallographic data from more strongly reduced ceria in which the oxygen vacancies are ordered. By studying strain induced structural changes, we show that it is possible to relate this lattice distortion to the chemical strain effect. Similar conclusions were previously reached for films of Ce 0.8Gd0.2O1.9. Since the ionic radii of both Gd3+ and Ce3+ are larger than that of Ce4+, we suggest that when cation dopants are larger than the host, ceria compounds containing a high concentration of oxygen vacancies may exhibit elastic anomalies.",
keywords = "Chemical strain, Elasticity, Extended X-ray absorption fine structure spectroscopy (EXAFS), Gadolinium-doped ceria, Thermal expansion",
author = "Anna Kossoy and Frenkel, {Anatoly I.} and Yishay Feldman and Ellen Wachtel and Alla Milner and Igor Lubomirsky",
year = "2010",
month = "10",
day = "25",
doi = "10.1016/j.ssi.2010.09.001",
language = "English",
volume = "181",
pages = "1473--1477",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",
number = "33-34",

}

TY - JOUR

T1 - The origin of elastic anomalies in thin films of oxygen deficient ceria, CeO2 - X

AU - Kossoy, Anna

AU - Frenkel, Anatoly I.

AU - Feldman, Yishay

AU - Wachtel, Ellen

AU - Milner, Alla

AU - Lubomirsky, Igor

PY - 2010/10/25

Y1 - 2010/10/25

N2 - Self-supported films of CeO1.95 display time-scale dependent elastic moduli, a phenomenon which has been termed the chemical strain effect. In order to probe the possible structural origins of this behavior, extended X-ray absorption fine structure spectroscopy and X-ray diffraction were used. Evidence was found that, although this oxygen deficient ceria appears to maintain the fluorite structure on average, the mean Ce-O bond length is shorter than the mean Ce-oxygen vacancy distance. This finding is consistent with crystallographic data from more strongly reduced ceria in which the oxygen vacancies are ordered. By studying strain induced structural changes, we show that it is possible to relate this lattice distortion to the chemical strain effect. Similar conclusions were previously reached for films of Ce 0.8Gd0.2O1.9. Since the ionic radii of both Gd3+ and Ce3+ are larger than that of Ce4+, we suggest that when cation dopants are larger than the host, ceria compounds containing a high concentration of oxygen vacancies may exhibit elastic anomalies.

AB - Self-supported films of CeO1.95 display time-scale dependent elastic moduli, a phenomenon which has been termed the chemical strain effect. In order to probe the possible structural origins of this behavior, extended X-ray absorption fine structure spectroscopy and X-ray diffraction were used. Evidence was found that, although this oxygen deficient ceria appears to maintain the fluorite structure on average, the mean Ce-O bond length is shorter than the mean Ce-oxygen vacancy distance. This finding is consistent with crystallographic data from more strongly reduced ceria in which the oxygen vacancies are ordered. By studying strain induced structural changes, we show that it is possible to relate this lattice distortion to the chemical strain effect. Similar conclusions were previously reached for films of Ce 0.8Gd0.2O1.9. Since the ionic radii of both Gd3+ and Ce3+ are larger than that of Ce4+, we suggest that when cation dopants are larger than the host, ceria compounds containing a high concentration of oxygen vacancies may exhibit elastic anomalies.

KW - Chemical strain

KW - Elasticity

KW - Extended X-ray absorption fine structure spectroscopy (EXAFS)

KW - Gadolinium-doped ceria

KW - Thermal expansion

UR - http://www.scopus.com/inward/record.url?scp=77958099002&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77958099002&partnerID=8YFLogxK

U2 - 10.1016/j.ssi.2010.09.001

DO - 10.1016/j.ssi.2010.09.001

M3 - Article

VL - 181

SP - 1473

EP - 1477

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

IS - 33-34

ER -