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

Materials Science and Engineering

Weizmann Institute of Science
University of Florida

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

23 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 - Apr 1 2019

Keywords

Anelasticity
Mechanical properties
Nanoindentation
Sm-doped ceria
Sound velocity

Access to Document

10.1016/j.scriptamat.2018.12.024

Cite this

@article{fc5cfa12bba140a6a0c413b9855f39f5,

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

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.",

keywords = "Anelasticity, Mechanical properties, Nanoindentation, Sm-doped ceria, Sound velocity",

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

note = "Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2019",

month = apr,

day = "1",

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

language = "English",

volume = "163",

pages = "19--23",

journal = "Scripta Materialia",

issn = "1359-6462",

}

TY - JOUR

T1 - Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics

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 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.

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.

KW - Anelasticity

KW - Mechanical properties

KW - Nanoindentation

KW - Sm-doped ceria

KW - Sound velocity

UR - https://www.scopus.com/pages/publications/85059346778

U2 - 10.1016/j.scriptamat.2018.12.024

DO - 10.1016/j.scriptamat.2018.12.024

M3 - Article

AN - SCOPUS:85059346778

SN - 1359-6462

VL - 163

SP - 19

EP - 23

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this