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

Nimrod Yavo; David Noiman; Ellen Wachtel; Sangtae Kim; Yishay (Isai) 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
, Yishay (Isai) Feldman
, Igor Lubomirsky
, Ori Yeheskel

Weizmann Institute of Science

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

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

Keywords

Elastic properties
Gd-doped ceria
Porosity
Sound velocity

ASJC Scopus subject areas

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

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10.1016/j.scriptamat.2016.05.029

Cite this

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title = "Elastic moduli of pure and gadolinium doped ceria revisited: Sound velocity measurements",

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.",

keywords = "Elastic properties, Gd-doped ceria, Porosity, Sound velocity",

author = "Nimrod Yavo and David Noiman and Ellen Wachtel and Sangtae Kim and Feldman, \{Yishay (Isai)\} and Igor Lubomirsky and Ori Yeheskel",

year = "2016",

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day = "1",

doi = "10.1016/j.scriptamat.2016.05.029",

language = "English",

volume = "123",

pages = "86--89",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Elastic moduli of pure and gadolinium doped ceria revisited

T2 - Sound velocity measurements

AU - Yavo, Nimrod

AU - Noiman, David

AU - Wachtel, Ellen

AU - Kim, Sangtae

AU - Feldman, Yishay (Isai)

AU - Lubomirsky, Igor

AU - Yeheskel, Ori

PY - 2016/10/1

Y1 - 2016/10/1

N2 - 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.

AB - 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.

KW - Elastic properties

KW - Gd-doped ceria

KW - Porosity

KW - Sound velocity

UR - https://www.scopus.com/pages/publications/84974853921

U2 - 10.1016/j.scriptamat.2016.05.029

DO - 10.1016/j.scriptamat.2016.05.029

M3 - Article

SN - 1359-6462

VL - 123

SP - 86

EP - 89

JO - Scripta Materialia

JF - Scripta Materialia

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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