Hard X-ray resonant electronic spectroscopy in transition metal oxides

Fèvre, P. Le; Magnan, H.; Chandesris, D.; Jupille, Jacques; Bourgeois, S.; Barbier, Antoine; Drube, W.; Uozumi, Takayuki; Kotani, Akio

doi:10.1016/j.nima.2005.05.023

Cited by 12 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electronic structure of the NiO and Fe 2 O 3 compounds were studied using hard x-ray resonant photoemission [32]. This study was performed at the Ni K and Fe K x-ray absorption edges and probed the secondary Ni 3d and Fe 4p states [32]. The electronic structure of CeRh 3 was also studied using hard x-ray resonant photoelectron spectra [33].…”

Section: Comparison With Previous Workmentioning

confidence: 99%

Bulk-sensitive Mo 4d electronic structure of Sr₂FeMoO₆probed by high-energy Mo L₃resonant photoemission

Martins

Prado

Caneiro

et al. 2017

EPL

View full text Add to dashboard Cite

We studied the Mo 4d electronic structure of Sr2FeMoO6 using high-energy Mo L3 resonant photoemission. The experimental spectra are in good agreement with modified Becke-Johnson (mBJ) band structure calculations. The energy dependence of the spectra can be explained by the changes in the photoemission cross-sections. The Mo L3 resonant spectrum shows Mo 4d character below the Fermi level and mixed Mo 4d-O 2p character around 8.0 eV. The Mo 4d weight in the resonant spectrum is in good agreement with the calculated interference between the direct and decay terms. The high photon energy used in this study (about 2520 eV) provides a bulk-sensitive determination of the Mo 4d electronic structure.

show abstract

Section: Comparison With Previous Workmentioning

confidence: 99%

Bulk-sensitive Mo 4d electronic structure of Sr₂FeMoO₆probed by high-energy Mo L₃resonant photoemission

Martins

Prado

Caneiro

et al. 2017

EPL

View full text Add to dashboard Cite

show abstract

“…At intermediates energies, the A2-A3 peaks have been reported as a primary mixture of dipole transitions involving both 3d(t2g) and 3d(eg) orbitals with a minor contribution from quadrupole excitations with 3d(eg) final character. [32,[34][35][36] Empirically, it has been reported that A2 peak may arise predominantly from the surface structure of the anatase particles and/or from Ti species associated with the surface. [37] The increase of the intensity ratio of the two peaks (A2/A3) has then been associated with the increase of five-coordinated titanium, [38] instead in accordance with the correlation between the coordination numbers of Ti sites with the pre-edge peak positions reported by Farges et al [33] This figure shows that pre-edge features changed slightly as the ratio of Ce/Ti in the precursor increased.…”

Section: Microstructure Of Ceo 2 @Tio 2 @H-ceo 2 Hollow Core-shell Co...mentioning

confidence: 99%

Enhanced Photocatalytic Performance of TiO₂@CeO₂ Hollow Structure through Synergetic Surface and Interface Engineering

Lin

Chen

Hsu

et al. 2023

Advanced Sustainable Systems

View full text Add to dashboard Cite

In this study, a synergetic structural design is developed to improve the photocatalytic performance of the sub‐micro core–shell hollow sphere (TiO2@H‐CeO2). TiO2@H‐CeO2 with maximum surface/interface effect is chosen as the substrate and then reacts with different concentrations of Ce(NO3)3·6H2O solutions. Optical properties analysis shows that after the reaction, the band gap of the composite structure and the electron–hole recombination efficiency both decrease while the photodegradation ability is effectively improved. Spectroscopic and microscopic observations reveal two changes in the structure after the reaction. The first is the deposition of CeO2 nanoparticles that can be observed inside and on the surface of the shell; the second is the doping of Ce3+ in the TiO2 nanoparticles of this shell. The deposition of CeO2 particles increases the interfacial area between the CeO2 and TiO2 and facilitates the corresponding charge transfer. The Ce3+ doping in the TiO2 shell changes the optical properties of TiO2. Therefore, the improved performance of the composite structure can be attributed to the synergy of different surfaces and interfacial effects caused by the reactions.

show abstract

“…All these observations are consistent with the spectra already published in the literature on this compound. 39,[56][57][58][59][60][61][62][63] This spectrum shows a clear evolution as temperature increases. In the pre-edge region, intensities of peaks A1 and A2 are both increasing with temperature while peak A3 remains virtually unchanged.…”

Section: Comparison Between Calculated and Measured Spectramentioning

confidence: 99%

“…This is in agreement with most of previous studies. 32,39,[56][57][58][59][60][61][62] Note that the attribution of this peak to dipole transitions made by Wu et al 63 and Brydson et al 65 was seemingly due to artifacts introduced by the muffin-tin approximation. 39 Moreover, Fig.…”

Section: Pre-edge Region Analysismentioning

confidence: 99%

Assessing temperature effects on multipole contributions and angular dependence in core-level spectroscopies

et al. 2021

View full text Add to dashboard Cite

This study aims at assessing the thermal nuclei motion effects on the multipole transition channels involved in two core-level spectroscopies, X-ray Absorption Spectroscopy (XAS) and X-ray Raman Scattering (XRS). Temperature effects on the 1s → s monopole, 1s → p dipole and 1s → d quadrupole transitions are investigated using two reference systems for which we present original experimental data: α-Al2O3 at the Al K edge probed by XRS at room temperature and rutile TiO2 at the Ti K pre-edge probed by XAS at temperatures ranging from 6 K to 700 K. Through the latter, this work enlightens the part of the pre-edge peak enhancement due to temperature in the K pre-edge region of 3d transition metal, which is known to be routinely used to determine the concentration, valence or symmetry of the probed element in a given sample. Nuclear thermal fluctuations are taken into account using a method based on density functional theory that consists in averaging spectra over atomic configurations, generated within the harmonic approximation and obeying quantum statistics at finite temperature. Since only a finite number of such configurations are used, the numerically averaged spectra generally lose the symmetry of the equilibrium crystal positions. In this paper, we demonstrate that the physical average has to be symmetric and propose a method to restore the physical angular dependence of the spectra. The approach is successfully applied to investigate the angular dependent XAS spectra in rutile as a function of temperature. The two systems under study allow to draw general conclusions regarding the effect of nuclear quantum fluctuations on the different transition channels available to both core-level spectroscopies.

show abstract

Hard X-ray resonant electronic spectroscopy in transition metal oxides

Cited by 12 publications

References 34 publications

Bulk-sensitive Mo 4d electronic structure of Sr₂FeMoO₆probed by high-energy Mo L₃resonant photoemission

Bulk-sensitive Mo 4d electronic structure of Sr₂FeMoO₆probed by high-energy Mo L₃resonant photoemission

Enhanced Photocatalytic Performance of TiO₂@CeO₂ Hollow Structure through Synergetic Surface and Interface Engineering

Assessing temperature effects on multipole contributions and angular dependence in core-level spectroscopies

Contact Info

Product

Resources

About

Hard X-ray resonant electronic spectroscopy in transition metal oxides

Cited by 12 publications

References 34 publications

Bulk-sensitive Mo 4d electronic structure of Sr2FeMoO6probed by high-energy Mo L3resonant photoemission

Bulk-sensitive Mo 4d electronic structure of Sr2FeMoO6probed by high-energy Mo L3resonant photoemission

Enhanced Photocatalytic Performance of TiO2@CeO2 Hollow Structure through Synergetic Surface and Interface Engineering

Assessing temperature effects on multipole contributions and angular dependence in core-level spectroscopies

Contact Info

Product

Resources

About

Bulk-sensitive Mo 4d electronic structure of Sr₂FeMoO₆probed by high-energy Mo L₃resonant photoemission

Bulk-sensitive Mo 4d electronic structure of Sr₂FeMoO₆probed by high-energy Mo L₃resonant photoemission

Enhanced Photocatalytic Performance of TiO₂@CeO₂ Hollow Structure through Synergetic Surface and Interface Engineering