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 journalArticle

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.

Original languageEnglish
Pages (from-to)19-23
Number of pages5
JournalScripta Materialia
Volume163
DOIs
Publication statusPublished - Apr 1 2019

Fingerprint

Cerium compounds
fluorite
Oxygen vacancies
Fluorspar
Elastic moduli
mechanical properties
anelasticity
ceramics
Mechanical properties
oxygen
nanoindentation
acoustic velocity
bulk modulus
velocity measurement
crystal lattices
Acoustic variables measurement
stiffness
modulus of elasticity
elastic properties
ultrasonics

Keywords

  • Anelasticity
  • Mechanical properties
  • Nanoindentation
  • Sm-doped ceria
  • Sound velocity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Cite this

Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics. / Varenik, Maxim; Cohen, Sidney; Wachtel, Ellen; Frenkel, Anatoly I.; Nino, Juan Claudio; Lubomirsky, Igor.

In: Scripta Materialia, Vol. 163, 01.04.2019, p. 19-23.

Research output: Contribution to journalArticle

Varenik, Maxim ; Cohen, Sidney ; Wachtel, Ellen ; Frenkel, Anatoly I. ; Nino, Juan Claudio ; Lubomirsky, Igor. / Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics. In: Scripta Materialia. 2019 ; Vol. 163. pp. 19-23.
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