U-Zr alloy: XPS and TEM study of surface passivation

Paukov, M.; Tkach, I.; Huber, F.; Gouder, T.; Cieslar, Miroslav; Drozdenko, Daria; Minárik, Peter; Havela, L.

doi:10.1016/j.apsusc.2018.01.319

Cited by 23 publications

(6 citation statements)

References 16 publications

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“…As shown in Figure , the XPS spectra of Ba 3 d , Zr 3 p , Y 3 d , and O 1 s were used to explore the effect of plasma treatment on the surface stoichiometry of BZY thin films. More quantitative information can be provided by fitting the spectra of Ba 3 d and Y 3 d with 3 d 3/2 and 3 d 5/2 spin–orbit splitting doublets, respectively, and Zr 3 p with 3 p 1/2 and 3 p 3/2 spin–orbit splitting doublets, , as can be seen in Figure a–c. For the O 1 s spectra, since the adventitious hydroxyl group of water unavoidably adsorbs on the sample after exposure to air, the quantification of oxygen vacancies by the O 1 s spectra is difficult to achieve .…”

Section: Resultsmentioning

confidence: 99%

Effect of Surface Defect Engineering on Proton Conductivity in Yttrium-Doped Barium Zirconate Thin Films

Wang

Chen

et al. 2023

J. Phys. Chem. C

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Yttrium-doped barium zirconate (BZY) has been considered as a potential electrolyte candidate for intermediate-tolow temperature protonic ceramic fuel cell applications. However, the transport properties of BZY are often limited by the formation of highly resistive space charge zones at lattice discontinuities, such as lattice defects and surfaces. Unlike lattice defects, how to reduce the space charge effects at surfaces remains less explored. In this regard, surface defect engineering can be a meaningful way to regulate the proton transport of BZY by tailoring the space charge distribution close to the surface. Here, the Ar and/or O 2 plasma was used to prepare BZY thin films with different levels of surface defects. The results of electrochemical impedance spectroscopy and detailed structural characterization suggest that the plasma treatment is effective in improving the proton conductivities and lowering the activation energy of BZY thin films through the generation of negatively charged barium vacancy defects and the enrichment of yttrium dopants on the surface.

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Section: Resultsmentioning

confidence: 99%

Effect of Surface Defect Engineering on Proton Conductivity in Yttrium-Doped Barium Zirconate Thin Films

Wang

Chen

et al. 2023

J. Phys. Chem. C

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“…In contrast with the cubic PdCu/ZrO 2 , the monoclinic system presents two species for the Zr3p 3/2 , at 328.9 eV and 333.9, which might be due to different Zr oxidation states, see also the corresponding Zr3d spectrum in Figure S5 of Supplementary Materials [21], or to differential charging of the support. Two Zr MNV Auger transitions at KE = 144 eV and 153.3 eV are partially overlapping with the Pd-Zr spectra for hν = 500 eV [22].…”

Section: Post-reaction Uhv and In Situ Xps Surface Characterization Omentioning

confidence: 98%

Influence of the ZrO2 Crystalline Phases on the Nature of Active Sites in PdCu/ZrO2 Catalysts for the Methanol Steam Reforming Reaction—An In Situ Spectroscopic Study

et al. 2020

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In this work, the electronic properties of the metal sites in cubic and monoclinic ZrO2 supported Pd and PdCu catalysts have been investigated using CO as probe molecule in in-situ IR studies, and the surface composition of the outermost layers has been studied by APXPS (Ambient Pressure X-ray Photoemission Spectroscopy). The reaction products were followed by mass spectrometry, making it possible to relate the chemical properties of the catalysts under reaction conditions with their selectivity. Combining these techniques, it has been shown that the structure of the support (monoclinic or cubic ZrO2) affects the metal dispersion, mobility, and reorganization of metal sites under methanol steam reforming (MSR) conditions, influencing the oxidation state of surface metal species, with important consequences in the catalytic activity. Correlating the mass spectra of the reaction products with these spectroscopic studies, it was possible to conclude that electropositive metal species play an imperative role for high CO2 and H2 selectivity in the MSR reaction (less CO formation).

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“…5,6 According to thermodynamic equilibrium phase diagram, 7,8 both of U-Nb and U-Zr alloys have continuous solid solution of g-phase and miscibility gap in the high temperature region, which make it possible for the alloys to be used steadily at high temperatures. The addition of Nb and Zr can prevent oxidation of uranium 9 and reduce the chemical interaction of fuel-cladding. 10 Therefore, U-Nb and U-Zr alloys are considered the candidates of metallic nuclear fuels for next generation fast reactors.…”

Section: Introductionmentioning

confidence: 99%

Effect of irradiation-induced cascade mixing on spinodal decomposition in U–Nb and U–Zr alloys: a phase field study

Guo

Gong

et al. 2021

RSC Adv.

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U-Zr alloy: XPS and TEM study of surface passivation

Cited by 23 publications

References 16 publications

Effect of Surface Defect Engineering on Proton Conductivity in Yttrium-Doped Barium Zirconate Thin Films

Effect of Surface Defect Engineering on Proton Conductivity in Yttrium-Doped Barium Zirconate Thin Films

Influence of the ZrO2 Crystalline Phases on the Nature of Active Sites in PdCu/ZrO2 Catalysts for the Methanol Steam Reforming Reaction—An In Situ Spectroscopic Study

Effect of irradiation-induced cascade mixing on spinodal decomposition in U–Nb and U–Zr alloys: a phase field study

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