Local disorder in yttrium doped ceria (Ce1−xYxO2−x/2) probed by joint X-ray and Neutron Powder Diffraction

Coduri, Mauro; Scavini, Marco; Allieta, Mattia; Brunelli, Michela; Ferrero, C.

doi:10.1088/1742-6596/340/1/012056

Cited by 21 publications

(37 citation statements)

References 30 publications

(26 reference statements)

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“…It is instead not observed in Pr-doped samples for x ≤ 0.500. Previous PDF investigations [3,8,18,[32][33][34] demonstrated that this peak is the fingerprint of a longer M-M pair, arising from the ordering of oxygen vacancies and trivalent cations, reminiscent of a lower symmetry phase occurring, at least, at the local scale. It is also evident that the larger the Tb-doping amount, the larger the area of the peak: the area of the long M-M pair peak normalized to the one of the fluorite M-M distance (~3.8 Å) is plotted in Fig.…”

Section: Pr-and Tb-doped Ceriamentioning

confidence: 99%

Structural characterization of Tb- and Pr-doped ceria

et al. 2014

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Section: Pr-and Tb-doped Ceriamentioning

confidence: 99%

Structural characterization of Tb- and Pr-doped ceria

et al. 2014

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“…Biphasic model: In order to overcome this problem, a biphasic model [50] was applied to the short range G(r) curves. The model is composed of pure CeO 2 and RE 2 O 3 phases in the C-type form.…”

Section: Real Space Modellingmentioning

confidence: 99%

Rare Earth doped ceria: a combined X-ray and neutron pair distribution function study

Coduri

Brunelli²,

Scavini

et al. 2012

Zeitschrift für Kristallographie

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RareEarth doped ceria materials (Ce 1Àx RE x O 2Àx/2 ) are widely studied for their application in solid oxide fuel cell devices. In this work, RE(Yb, Y, Nd, La)-doped ceria samples at constant (x ¼ 0.25) doping rate were subjected to a combined synchrotron radiation and neutron powder diffraction study. The dopants were chosen in order to cover a wide range of dopant-ionic radii. The effect of doping on the average structure is investigated using conventional Rietveld analysis, while the Pair Distribution Function technique is used to explore the spatial extent of disorder as well as the local structure. Two models for mapping the local structure, in terms of oxygen relaxation and nano-phase separation, are presented.

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“…To overcome some of those drawbacks, we recently exploited the pair distribution function (PDF) method to investigate doped ceria compounds upon doping with Gd (Scavini et al, 2012), Y (Coduri et al, 2012a(Coduri et al, , 2013a, and other rare earths (Coduri et al, 2012b(Coduri et al, , 2014, also under fuel cell operating conditions (Coduri et al, 2013b). The advantage of the PDF analysis over EXAFS lies in that the PDF function [i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The PDF technique is also bulk-probing, as it relies on the scattered intensity from all the active volume of the sample. These capabilities are well suited to studying doped ceria, which brings in the so-called nanostructure problem (Billinge and Levin, 2007): the structure of concern is singlephase though perturbed on average by large, doping-induced static disorder, as inferred from the compositional evolution of atomic displacement parameters (Coduri et al, 2012a(Coduri et al, , 2012b(Coduri et al, , 2013bScavini et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Size and spatial correlation of defective domains in yttrium-doped CeO₂

et al. 2015

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The size of dopant-rich nanodomains was assessed in four samples of Ce 1−μ Y μ O 2−μ/2 through systematic pair distribution function (PDF) refinements. Experimental G(r) curves were fitted by different structural models with the aim of finding a description which balanced precise structure parameterization and reasonable number of parameters. The most reliable model was a single Y 2 O 3 -like phase, which best accommodated to the close relationship between the fluorite (CeO 2 -like) and C-type (Y 2 O 3 -like) structures. In this model, a refined cation coordinate, x(M2), measured the relative occurrence in the G(r) of the chemical environment of Y and Ce at any value of r. The r-value at which x(M2) vanished, i.e. at which the refined C-type cell becomes a redundant, low-symmetry description of a fluorite cell, was assumed as the size of a C-type domain. Subtle features in G(r) could be attributed to the fluorite or C-type phase up to~500 Å thanks to the narrow instrumental resolution function of the ID31 beamline (now ID22) at the ESRF, which allows us to get high resolution PDF data.

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Local disorder in yttrium doped ceria (Ce_1−xY_xO_2−x/2) probed by joint X-ray and Neutron Powder Diffraction

Cited by 21 publications

References 30 publications

Structural characterization of Tb- and Pr-doped ceria

Structural characterization of Tb- and Pr-doped ceria

Rare Earth doped ceria: a combined X-ray and neutron pair distribution function study

Size and spatial correlation of defective domains in yttrium-doped CeO₂

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Local disorder in yttrium doped ceria (Ce1−xYxO2−x/2) probed by joint X-ray and Neutron Powder Diffraction

Cited by 21 publications

References 30 publications

Structural characterization of Tb- and Pr-doped ceria

Structural characterization of Tb- and Pr-doped ceria

Rare Earth doped ceria: a combined X-ray and neutron pair distribution function study

Size and spatial correlation of defective domains in yttrium-doped CeO2

Contact Info

Product

Resources

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Local disorder in yttrium doped ceria (Ce_1−xY_xO_2−x/2) probed by joint X-ray and Neutron Powder Diffraction

Size and spatial correlation of defective domains in yttrium-doped CeO₂