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

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

13 Scopus citations

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
State	Published - 1 Apr 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 Acta Materialia Inc.

Keywords

Anelasticity
Mechanical properties
Nanoindentation
Sm-doped ceria
Sound velocity

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10.1016/j.scriptamat.2018.12.024

Cite this

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abstract = "Young's, shear and bulk moduli of Ce1-xSmxO2-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.",

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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

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AB - Young's, shear and bulk moduli of Ce1-xSmxO2-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.

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KW - Mechanical properties

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Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics

Abstract

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Keywords

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