Soft X-ray absorption spectroscopy of vanadium oxides

Abbate, M.; Pen, H. F.; Czyżyk, M. T.; Groot, Frank M. F. de; Fuggle, J. C.; Ma, Yong; Chen, C.T.; Sette, F.; Fujimori, A.; Ueda, Yutaka; Koyamada, Koji

doi:10.1016/0368-2048(93)80014-d

Cited by 129 publications

(111 citation statements)

References 28 publications

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“…The absorption spectrum at approximately 540-545 eV reflects the characters of the Cu 4sp and Fe 4sp bands. 2,14,16 In the MCD spectrum, also shown in Fig. 4, it is notable that negative signals are clearly observed around the Fe 3d region but are not so evident for the Cu 3d region.…”

Section: Resultsmentioning

confidence: 84%

“…Since the empty O 2p states hybridize with the 3d and 4sp states of cations in oxides, the observed O-XAS spectrum reflects the features of the electronic structures of the constituent transition-metal ions. 16 The spectrum from 527 to 530 eV mainly represents the nature of the Fe 3d bands, while that at approximately 532 eV shows the nature of the Cu 3d bands (the upper Hubbard band). The absorption spectrum at approximately 540-545 eV reflects the characters of the Cu 4sp and Fe 4sp bands.…”

Section: Resultsmentioning

confidence: 99%

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Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3Fe
Mizumaki
¹
,
Chen
²
,
Saito
³

et al. 2011
Phys. Rev. B
44
2
22
0
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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3Fe
Mizumaki
¹
,
Chen
²
,
Saito
³

et al. 2011
Phys. Rev. B
44
2
22
0
View full text Add to dashboard Cite

“…It is well known from low resolution X-ray absorption spectra of vanadium compounds that the position of the maximum of the V L 3 -edge can be directly correlated to the oxidation state (43)(44)(45). In order to transfer this relationship to the high resolution spectra reported in Figure 8 the VOHPO 4 .0.5H 2 O), and catalysts with independently determined oxidation state (by titration and from the position of the pre-peak at the V K-edge (46)) a linear correlation between E centre and the average oxidation state of the material was found ( Figure 10).…”

Section: Figure 10mentioning

confidence: 99%

Amorphous Vanadium Phosphate Catalysts Prepared Using Precipitation with Supercritical CO2 as an Antisolvent

Hutchings

López-Sánchez²,

Bartley³

et al. 2002

Journal of Catalysis

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A new preparative route for vanadium phosphate catalysts is described using supercritical CO2 as an antisolvent. The amorphous microspheroidal VPO produced is shown to be more active than comparable crystalline VPO catalysts for the selective oxidation of n-butane to maleic anhydride and, furthermore, does not require an extensive pre-treatment or activation period to establish full catalytic activity. VPO catalysts prepared using supercritical CO2 as an antisolvent maintain their amorphous nature throughout the catalyst test period. In contrast, amorphous VPO catalysts can also be prepared using liquid CO2 as antisolvent, or by solvent evaporation in vacuo, however, these materials are found to partially crystallise during the oxidation of n-butane. The wholly amorphous catalysts are characterised using transmission electron microscopy, X-ray absorption spectroscopy, 31 P spin echo mapping NMR spectroscopy and X-ray photoelectron spectroscopy. The role of amorphous material in vanadium phosphate catalysis is discussed in detail.

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“…carbon, nitrogen, oxygen [90,91] or sulphur [92] and/or at the L edges of 3d transition metals [93,94].…”

Section: Soft X-ray Absorption Spectroscopymentioning

confidence: 99%

X-Ray Absorption Spectroscopy and Anomalous Wide Angle X-Ray Scattering: Two Basic Tools in the Analysis of Heterogeneous Catalysts

Bazin¹,

Lynch²,

Ramos-Fernandez³

2003

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Spectroscopie d'absorption et diffusion anomale à grands angles des rayons X : deux outils de base dans l'analyse de catalyseurs hétérogènes -Notre compréhension des processus physicochimiques à l'échelle atomique dans des nanomatériaux a progressé de manière notoire ces dernières décennies grâce à l'émergence de techniques liées au rayonnement synchrotron. Dans cet article, nous décrivons la spectroscopie d'absorption des rayons X mous et durs et la diffusion anomale des rayons X, deux techniques se servant des propriétés spécifiques d'un faisceau synchrotron, en particulier de la large gamme spectrale. Nous centrons la présentation sur les avancées dans la description de catalyseurs hétérogènes. Les apports et les limitations de chaque technique sont analysés. Abstract -X-Ray Absorption Spectroscopy and Anomalous Wide Angle X-Ray Scattering: Two Basic Tools in the Analysis of Heterogeneous Catalysts -In the past decades, our understanding of physicochemical processes at the atomic level in nanomaterials has been significantly improved by the emergence of synchrotron radiation related techniques. In this review paper, we describe two techniques:X-ray absorption spectroscopy (XAS) using soft and hard X-rays, and anomalous wide angle X-ray scattering (AWAXS), both of which use some of the specific properties of a synchrotron beam, in particular the wide spectral range. We focus on the numerous breakthroughs which have been achieved using these techniques in describing heterogeneous catalysts. The merits and shortcomings of each technique are discussed.

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Soft X-ray absorption spectroscopy of vanadium oxides

Cited by 129 publications

References 28 publications

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3Fe
Mizumaki
¹
,
Chen
²
,
Saito
³

et al. 2011
Phys. Rev. B
44
2
22
0
View full text Add to dashboard Cite

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3Fe
Mizumaki
¹
,
Chen
²
,
Saito
³

et al. 2011
Phys. Rev. B
44
2
22
0
View full text Add to dashboard Cite

Amorphous Vanadium Phosphate Catalysts Prepared Using Precipitation with Supercritical CO2 as an Antisolvent

X-Ray Absorption Spectroscopy and Anomalous Wide Angle X-Ray Scattering: Two Basic Tools in the Analysis of Heterogeneous Catalysts

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Soft X-ray absorption spectroscopy of vanadium oxides

Cited by 129 publications

References 28 publications

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3FeMizumaki1, Chen2, Saito3 et al. 2011Phys. Rev. B442220View full textAdd to dashboardCite

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3FeMizumaki1, Chen2, Saito3 et al. 2011Phys. Rev. B442220View full textAdd to dashboardCite

Amorphous Vanadium Phosphate Catalysts Prepared Using Precipitation with Supercritical CO2 as an Antisolvent

X-Ray Absorption Spectroscopy and Anomalous Wide Angle X-Ray Scattering: Two Basic Tools in the Analysis of Heterogeneous Catalysts

Contact Info

Product

Resources

About

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3Fe
Mizumaki
¹
,
Chen
²
,
Saito
³

et al. 2011
Phys. Rev. B
44
2
22
0
View full text Add to dashboard Cite

Direct observation of the ferrimagnetic coupling ofA-site Cu andB-site Fe spins in charge-disproportionated CaCu3Fe
Mizumaki
¹
,
Chen
²
,
Saito
³

et al. 2011
Phys. Rev. B
44
2
22
0
View full text Add to dashboard Cite