Influence of Gd content on the room temperature mechanical properties of Gd-doped ceria

Roman Korobko; Chien Ting Chen; Sangtae Kim; Sidney R. Cohen; Ellen Wachtel; Nimrod Yavo; Igor Lubomirsky

doi:10.1016/j.scriptamat.2011.10.027

Influence of Gd content on the room temperature mechanical properties of Gd-doped ceria

Roman Korobko, Chien Ting Chen, Sangtae Kim, Sidney R. Cohen, Ellen Wachtel, Nimrod Yavo, Igor Lubomirsky

Weizmann Institute of Science, Israel

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

31 Citations (Scopus)

Abstract

High-density ceramics of ceria doped with 0, 3, 5, 10, 15 and 20 mol.% Gd and with grain sizes exceeding 1.5 μm were investigated by nanoindentation. The deduced elastic moduli are independent of Gd content and remain close to the value reported for bulk ceramics (210 ± 5% GPa). All ceramics exhibit transient creep with displacement proportional to the 1/3 power of the time. For 0.05 < x < 0.2, the derived creep magnitude parameter decreases linearly with increasing Gd content. These results strongly suggest that defect rearrangement influences the measurements.

Original language	English
Pages (from-to)	155-158
Number of pages	4
Journal	Scripta Materialia
Volume	66
Issue number	3-4
DOIs	https://doi.org/10.1016/j.scriptamat.2011.10.027
Publication status	Published - Feb 1 2012

Keywords

Creep rate
Elastic modulus
Gd-doped ceria
Nanoindentation

ASJC Scopus subject areas

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

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abstract = "High-density ceramics of ceria doped with 0, 3, 5, 10, 15 and 20 mol.% Gd and with grain sizes exceeding 1.5 μm were investigated by nanoindentation. The deduced elastic moduli are independent of Gd content and remain close to the value reported for bulk ceramics (210 ± 5% GPa). All ceramics exhibit transient creep with displacement proportional to the 1/3 power of the time. For 0.05 < x < 0.2, the derived creep magnitude parameter decreases linearly with increasing Gd content. These results strongly suggest that defect rearrangement influences the measurements.",

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AU - Wachtel, Ellen

AU - Yavo, Nimrod

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AB - High-density ceramics of ceria doped with 0, 3, 5, 10, 15 and 20 mol.% Gd and with grain sizes exceeding 1.5 μm were investigated by nanoindentation. The deduced elastic moduli are independent of Gd content and remain close to the value reported for bulk ceramics (210 ± 5% GPa). All ceramics exhibit transient creep with displacement proportional to the 1/3 power of the time. For 0.05 < x < 0.2, the derived creep magnitude parameter decreases linearly with increasing Gd content. These results strongly suggest that defect rearrangement influences the measurements.

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