Elastic moduli of pure and gadolinium doped ceria revisited: Sound velocity measurements

Nimrod Yavo; David Noiman; Ellen Wachtel; Sangtae Kim; Yishai Feldman; Igor Lubomirsky; Ori Yeheskel

doi:10.1016/j.scriptamat.2016.05.029

Elastic moduli of pure and gadolinium doped ceria revisited: Sound velocity measurements

Nimrod Yavo, David Noiman, Ellen Wachtel, Sangtae Kim, Yishai Feldman, Igor Lubomirsky, Ori Yeheskel

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

41 Scopus citations

Abstract

The Young's, shear and bulk moduli of dense (> 95%) Gd-doped ceria (Ce_1-xGd_xO_2-x/2) ceramics were determined as a function of Gd content using the ultrasonic pulse-echo method and corrected for porosity according to both static and dynamic models. With increasing defect concentration (0-20 mol% Gd), the Young's and shear moduli decrease linearly by 10% while for 29 mol%, the values lie above the linear fit; the bulk modulus decreases linearly within the complete range. We conclude that structural changes, induced by oxygen vacancy ordering for x > 0.2, may influence the uniaxial and shear moduli, leaving the bulk modulus unaffected.

Original language	English
Pages (from-to)	86-89
Number of pages	4
Journal	Scripta Materialia
Volume	123
DOIs	https://doi.org/10.1016/j.scriptamat.2016.05.029
State	Published - 1 Oct 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.

Keywords

Elastic properties
Gd-doped ceria
Porosity
Sound velocity

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10.1016/j.scriptamat.2016.05.029

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abstract = "The Young's, shear and bulk moduli of dense (> 95%) Gd-doped ceria (Ce1-xGdxO2-x/2) ceramics were determined as a function of Gd content using the ultrasonic pulse-echo method and corrected for porosity according to both static and dynamic models. With increasing defect concentration (0-20 mol% Gd), the Young's and shear moduli decrease linearly by 10% while for 29 mol%, the values lie above the linear fit; the bulk modulus decreases linearly within the complete range. We conclude that structural changes, induced by oxygen vacancy ordering for x > 0.2, may influence the uniaxial and shear moduli, leaving the bulk modulus unaffected.",

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AU - Yavo, Nimrod

AU - Noiman, David

AU - Wachtel, Ellen

AU - Kim, Sangtae

AU - Feldman, Yishai

AU - Lubomirsky, Igor

AU - Yeheskel, Ori

PY - 2016/10/1

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Elastic moduli of pure and gadolinium doped ceria revisited: Sound velocity measurements

Abstract

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Keywords

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