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Lad, Robert J.; Henrich, Victor E.

doi:10.1103/physrevb.39.13478

Cited by 192 publications

(110 citation statements)

References 38 publications

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“…The same peak is found at 58 eV for ␣-Fe 2 O 3 ͑Fe 3+ ͒. 25 For FeO ͑Fe 2+ ͒, on-and off-resonance energies are reported to be 57 and 53 eV, respectively. 26 From this comparison, we conclude that 3p-3d absorption is mainly due to Fe 3+ ions.…”

Section: Resultssupporting

confidence: 56%

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka

Kobayashi

Sakamoto

et al. 2010

Journal of Applied Physics

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Articles you may be interested inEvidence of a cluster glass-like behavior in Fe-doped ZnO nanoparticles J. Appl. Phys. 115, 17E123 (2014) We have studied the electronic structure of Fe-doped ZnO nanoparticles, which have been reported to show ferromagnetism at room temperature, by x-ray photoemission spectroscopy, resonant photoemission spectroscopy, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism ͑XMCD͒. From the experimental and cluster-model calculation results, we find that Fe atoms are predominantly in the Fe 3+ ionic state with mixture of a small amount of Fe 2+ and that Fe 3+ ions are dominant in the surface region of the nanoparticles. It is shown that the room temperature ferromagnetism in the Fe-doped ZnO nanoparticles primarily originated from the antiferromagnetic coupling between unequal amounts of Fe 3+ ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of ϳ2 -3 nm.

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Section: Resultssupporting

confidence: 56%

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka

Kobayashi

Sakamoto

et al. 2010

Journal of Applied Physics

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“…2 are straightforwardly assigned to O 2p states but the region below 5 eV is more difficult to interpret due to the mixed TM 3d-O 2p states. VB spectra qualitatively agree with the previous studies 21,40,50,51 , in the present work the spectral features are much better resolved. Pt 5d states still contribute to the spectra taken in normal electron emission geometry whereas they nearly vanish in grazing geometry.…”

Section: Discussionsupporting

confidence: 82%

“…As in XES spectra, O 2p derived states in FeO (5.3 eV) shifts to lower BE in CoO (4.9 eV). Previous resonant photoemission studies at the TM 3p→3d absorption threshold identified the resonant enhancements of 3d derived states in VB XPS spectra 50,51 . In the light of these studies, the sharp peak just 1 eV below the Fermi edge, broad peaks covering 1-4 eV and 8-14 eV energy region are assigned to TM 3d states, the former with strongly hybridized characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…In the light of these studies, the sharp peak just 1 eV below the Fermi edge, broad peaks covering 1-4 eV and 8-14 eV energy region are assigned to TM 3d states, the former with strongly hybridized characteristics. The peak at ~1 eV is assigned to well screened d n L (n=6, 7 in [50][51][52] . The energy difference between these high BE peaks and the first TM 3d absorption resonance peak above the Fermi level (presumably at the same energy as the first resonance in O XAS) corresponds to U dd and it is certainly higher than 11 eV.…”

Section: Discussionmentioning

confidence: 99%

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Identification of the electronic structure differences between polar isostructural FeO and CoO films by core-level soft x-ray spectroscopy

et al. 2013

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The electronic properties of the FeO and CoO single layer thin films on Pt(111) were examined by core level soft X-ray spectroscopy. These oxygen terminated films are bilayer-thick and isostructural, Pt, Fe-Co, and O atoms stacked with small lateral shifts due to incommensurate relation with Pt(111). Probing occupied and unoccupied states projected on the oxygen atoms revealed states at the Fermi level suggesting orbital mixing with the metal substrate and also indicated an anisotropy in transition metal-oxygen bonding geometry. The differences in the core level spectral features were attributed to the substrate induced modification of the charge transfer energy and with an additional valence electron on Co.

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“…By taking the difference between valence-band energy distribution curves (EDC's) measured just above and below the Fe3p→3d resonance energy, the nonresonating O2p contributions are eliminated and the distribution of Fe3d derived final states is obtained. This was done for the first time by Fujimori et [241]. Furthermore, constantinitial-state (CIS) spectra measured across the Fe3p excitation threshold can be used to distinguish the 3d n-1 from the 3d n L photoemission final states, i.e., one can identify strongly hybridized Fe-O states in the valence-band (L is a hole state in an O ligand) [239,240,[242][243][244].…”

Section: Ups Valence-band Spectramentioning

confidence: 99%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

579

610

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Metal-oxide based catalysts are used for many important synthesis reactions in the chemical industry. A better understanding of the catalyst operation can be achieved by studying elemantary reaction steps on well-defined model catalyst systems. For the dehydrogenation of ethylbenzene to styrene in the presence of steam both unpromoted and potassium promoted iron-oxide catalysts are active. Here we review the work done over unpromoted single-crystalline FeO(111), Fe 3 O 4 (111) and α-Fe 2 O 3 (0001) films grown epitaxially on Pt(111) substrates. Their geometric and electronic surface structures were characterized by STM, LEED, electron microscopy and electron spectroscopic techniques. In an integrative approach, the interaction of water, ethylbenzene and styrene with these films was investigated mainly by thermal desorption and photoelectron emission spectroscopy. The adsorptiondesorption energetics and kinetics depend on the oxide surface terminations and are correlated to the electronic structures and acid-base properties of the corresponding oxide phases, which reveal insight into the nature of the active sites and into the catalytic function of semiconducting oxides in general. Catalytic studies, using a batch reactor arrangement at high gas pressures and post reaction surface analysis, showed that only α-Fe 2 O 3 (0001) containing surface defects is catalytically active, whereas Fe 3 O 4 (111) is always inactive. This can be related to the elementary adsorption and desorption properties observed in ultrahigh vacuum, which indicates that the surface chemical properties of the iron-oxide films do not change significantly across the "pressure-gap". A model is proposed according to which the active site involves a regular acidic surface sites and a defect site next to it. The results on metal-oxide surface chemistry also have implications for other fields, such as environmental science, biophysics and chemical sensors.-2 -"2kyEi9FYSQjBVrZxIPQ.FHIAC_WRa02_review.doc", Datum: 19.02.03

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Photoemission study of the valence-band electronic structure inFexO,Fe3

Cited by 192 publications

References 38 publications

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Identification of the electronic structure differences between polar isostructural FeO and CoO films by core-level soft x-ray spectroscopy

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

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