2013
DOI: 10.1002/adfm.201301536
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The Role of Point Defects in the Mechanical Behavior of Doped Ceria Probed by Nanoindentation

Abstract: The influence of dopant size and oxygen vacancy concentration on the room temperature elastic modulus and creep rate of ceria doped with Pr4+, Pr3+, Lu3+, and Gd3+, is investigated using a nanoindentation technique. Measurements are conducted with both fast (15 mN s−1) and slow (0.15 mN s−1) loading modes, including a load‐hold stage at 150 mN of 8 s and 30 s, respectively. Based on the data obtained using the fast loading mode, it is found that: 1) the dopant size is a primary determinant of the elastic modul… Show more

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Cited by 39 publications
(62 citation statements)
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References 45 publications
(80 reference statements)
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“…Ceria, especially doped ceria, displays anelastic mechanical behavior, due, at least in part, to the dipolar strain fields developed in the vicinity of oxygen vacancies . As the dopant concentration increases, the elastic moduli of doped ceria decrease; and in the presence of applied anisotropic stress, the mechanical response may be time dependent . When stress is applied at sufficiently high frequency and/or isotropically, the dipolar strain fields do not respond and the material behaves elastically .…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Ceria, especially doped ceria, displays anelastic mechanical behavior, due, at least in part, to the dipolar strain fields developed in the vicinity of oxygen vacancies . As the dopant concentration increases, the elastic moduli of doped ceria decrease; and in the presence of applied anisotropic stress, the mechanical response may be time dependent . When stress is applied at sufficiently high frequency and/or isotropically, the dipolar strain fields do not respond and the material behaves elastically .…”
Section: Discussionmentioning
confidence: 99%
“…In such devices, films can experience large tensile or compressive strain (≈0.5%), either retained from deposition processes or developed during heterogeneous layer stacking. Doped ceria has been reported to be anelastic, that is, it exhibits time‐dependent elastic moduli. On a time scale shorter than a few seconds, the moduli are unrelaxed and Young's modulus exceeds 200 GPa, while on a time scale of minutes to months, the biaxial Young's modulus of Gd‐doped ceria is <30 GPa .…”
Section: Introductionmentioning
confidence: 99%
“…This complexity has two sources. i) CGO is strongly anelastic . The frequency range of the anelasticity (<0.5 Hz) clearly overlaps the frequency range within which nonclassical electrostriction is observed, making precise identification of the nature of the response difficult.…”
Section: Introductionmentioning
confidence: 96%
“…For doped UO 2 fuels, another feature of the Raman spectra is the peaks between 500 and 700 cm -1 . The intensity of the peaks in this region appeared to increase with accumulation of structure defects introduced to UO 2 crystal lattice by oxide doping [48]. Another study underlined the appearance of peaks at this range for U 4 O 9 ; whereas no peaks were found in this region for UO 2 [49].…”
Section: Fuel Chemistry and Stoichiometry By Xrd And Raman Analysismentioning
confidence: 94%
“…Another peak, located at ~ 630 cm -1 , displayed noticeable intensity changes which can attributed to cuboctahedra constituting U 4 O 9 phase [47,49]. However, this assignment has been questioned recently since this peak can also be observed at stoichiometric SIMFUEL UO 2 (simulated high burn-up fuel) [48]. Similarly, this peak appears on the spectrum obtained from stoichiometric 1500-undoped UO 2 pellet.…”
Section: Fuel Chemistry and Stoichiometry By Xrd And Raman Analysismentioning
confidence: 99%