Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics

Maxim Varenik; Sidney Cohen; Ellen Wachtel; Anatoly I. Frenkel; Juan Claudio Nino; Igor Lubomirsky

doi:10.1016/j.scriptamat.2018.12.024

Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics

Maxim Varenik, Sidney Cohen, Ellen Wachtel, Anatoly I. Frenkel, Juan Claudio Nino, Igor Lubomirsky^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Young's, shear and bulk moduli of Ce _1-xSm _xO _2-x/2 (x ≤ 0.55) were studied using ultrasonic time of flight and nanoindentation techniques. Sound velocity measurements, corrected for sample porosity, demonstrate decrease in the unrelaxed ceramic moduli with increasing Sm-content. Room temperature creep under indenter load-hold, as well as time-dependent material stiffness, reveal a transition from prominent anelasticity in the fluorite phase to prominent elasticity in the double fluorite phase. This supports rearrangement of elastic dipoles under anisotropic stress, which occurs more readily when oxygen vacancies are not ordered on the crystal lattice, as the source of ceria anelastic behavior.

Original language	English
Pages (from-to)	19-23
Number of pages	5
Journal	Scripta Materialia
Volume	163
DOIs	https://doi.org/10.1016/j.scriptamat.2018.12.024
Publication status	Published - 1 Apr 2019

Funding

IL and AIF acknowledge the NSF-BSF program grant 2015679. AIF acknowledges support by NSF Grant number DMR-1701747. This work was supported in part by the Israeli Ministry of Science and Technology grant 3-12944. This research is made possible in part by the historic generosity of the Harold Perlman Family.

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2018.12.024

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title = "Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics",

abstract = "Young's, shear and bulk moduli of Ce 1-xSm xO 2-x/2 (x ≤ 0.55) were studied using ultrasonic time of flight and nanoindentation techniques. Sound velocity measurements, corrected for sample porosity, demonstrate decrease in the unrelaxed ceramic moduli with increasing Sm-content. Room temperature creep under indenter load-hold, as well as time-dependent material stiffness, reveal a transition from prominent anelasticity in the fluorite phase to prominent elasticity in the double fluorite phase. This supports rearrangement of elastic dipoles under anisotropic stress, which occurs more readily when oxygen vacancies are not ordered on the crystal lattice, as the source of ceria anelastic behavior. ",

author = "Maxim Varenik and Sidney Cohen and Ellen Wachtel and Frenkel, {Anatoly I.} and Nino, {Juan Claudio} and Igor Lubomirsky",

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doi = "10.1016/j.scriptamat.2018.12.024",

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AU - Varenik, Maxim

AU - Cohen, Sidney

AU - Wachtel, Ellen

AU - Frenkel, Anatoly I.

AU - Nino, Juan Claudio

AU - Lubomirsky, Igor

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Young's, shear and bulk moduli of Ce 1-xSm xO 2-x/2 (x ≤ 0.55) were studied using ultrasonic time of flight and nanoindentation techniques. Sound velocity measurements, corrected for sample porosity, demonstrate decrease in the unrelaxed ceramic moduli with increasing Sm-content. Room temperature creep under indenter load-hold, as well as time-dependent material stiffness, reveal a transition from prominent anelasticity in the fluorite phase to prominent elasticity in the double fluorite phase. This supports rearrangement of elastic dipoles under anisotropic stress, which occurs more readily when oxygen vacancies are not ordered on the crystal lattice, as the source of ceria anelastic behavior.

AB - Young's, shear and bulk moduli of Ce 1-xSm xO 2-x/2 (x ≤ 0.55) were studied using ultrasonic time of flight and nanoindentation techniques. Sound velocity measurements, corrected for sample porosity, demonstrate decrease in the unrelaxed ceramic moduli with increasing Sm-content. Room temperature creep under indenter load-hold, as well as time-dependent material stiffness, reveal a transition from prominent anelasticity in the fluorite phase to prominent elasticity in the double fluorite phase. This supports rearrangement of elastic dipoles under anisotropic stress, which occurs more readily when oxygen vacancies are not ordered on the crystal lattice, as the source of ceria anelastic behavior.

U2 - 10.1016/j.scriptamat.2018.12.024

DO - 10.1016/j.scriptamat.2018.12.024

M3 - Article

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EP - 23

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics

Abstract

Funding

All Science Journal Classification (ASJC) codes

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