Oxide phonon spectra

Beattie, I. R.; Gilson, T. R.

doi:10.1039/j19690002322

Cited by 214 publications

(98 citation statements)

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“…This can be explained by the very weak bond and therefore almost missing hybridisation between these atoms. This is in agreement with findings in vibrational spectroscopy studies of this material [26]. In this framework V 1 -V 4 represent mainly the t 2g states while V 5 is attributed to the broad e g states in the DOS.…”

Section: Resultssupporting

confidence: 81%

Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts

Hävecker

Knop‐Gericke

Mayer

et al. 2002

Journal of Electron Spectroscopy and Related Phenomena

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We present the V L3 near edge X-ray absorption fine structure (NEXAFS) of a vanadium phosphorus oxide (VPO) catalyst. The spe ctrum is related to the V3d-O2p hybridised unoccupied states. The overall peak position at the V L3-absorption edge is determined by the formal oxidation state of the absorbing vanadium atom. Details of the absorption fine structure are influenced by the geometric structure of the compound. Empirically we found a linear relationship between the energy position of several absorption resonances and the V -O bond length of the participating atoms. This allows to identify the contribution of specific V-O bonds to the near edge X-ray absorption fine structure. The bond length / resonance position relationship will be discussed under consideration of relations between geometric structure and NEXAFS features observed in X-ray absorption experiments and theory.

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Section: Resultssupporting

confidence: 81%

Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts

Hävecker

Knop‐Gericke

Mayer

et al. 2002

Journal of Electron Spectroscopy and Related Phenomena

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“…Consequently, 2.0 % Bi-doped ms-TiO 2 reduces the energy gap of the catalyst, thereby shifting the excitation source from UV to the visible light. , [37] and can be assigned to the E g , B 1g , A 1g , B 2g , and E g vibrational modes of TiO 2 , respectively. These results are consistent with the XRD measurements.…”

Section: Resultsmentioning

confidence: 99%

Bismuth‐Doped Ordered Mesoporous TiO₂: Visible‐Light Catalyst for Simultaneous Degradation of Phenol and Chromium

Shamaila

Leghari

Chen

et al. 2010

Chemistry A European J

129

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A controllable and reproducible synthesis of highly ordered two-dimensional hexagonal mesoporous, crystalline bismuth-doped TiO(2) nanocomposites with variable Bi ratios is reported here. Analyses by transmission electron microscopy, X-ray diffraction, Raman, and X-ray photoelectron spectroscopy reveal that the well-ordered mesostructure is doped with Bi, which exists as Bi(3+) and Bi((3+x+)). The Bi-doped mesoporous TiO(2) (ms-TiO(2)) samples exhibit improved photocatalytic activities for simultaneous phenol oxidation and chromium reduction in aqueous suspension under visible and UV light over the pure ms-TiO(2), P-25, and conventional Bi-doped titania. The high catalytic activity is due to both the unique structural characteristics and the Bi doping. This new material extends the spectral response from UV to the visible region, and reduces electron-hole recombination, which renders the 2.0% Bi-doped ms-TiO(2) photocatalyst highly responsive to visible light.

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“…Spectrum (c) was measured at 673 K. In Spectra (a), (b) and (c), three intense Raman peaks attributed to anatase appear. 23) At 673 K, position of the Raman shift is changed by 4 to 9 cm À1 . It is probably for the same reason described previously.…”

Section: Resultsmentioning

confidence: 99%

An in Situ Raman Spectroscopy System for Long-term Corrosion Experiments in High Temperature Water up to 673 K

Domae

Tani

Fujiwara

et al. 2006

J. Nucl. Sci. Technol.

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A Raman spectroscopy system has been developed, in order to identify metal oxides formed on the surfaces of metals and steels in high temperature water up to 673 K. A supercritical water loop system including a Raman cell was installed. The design of the loop system is up to 673 K and 40 MPa. The Raman cell has a diamond window without window-to-metal packing. Raman spectrum of alumina plate was measured at room temperature, at 523 K and at 673 K under pressure of 25 MPa. A long-term measurement was also performed at 523 K and 25 MPa for 117.5 h. In all cases intense Raman peaks attributed to alumina were observed. Raman spectrum of anatase particles in suspension was measured at 673 K and 25 MPa. The results show that the Raman spectroscopy system developed in the present study works well not only for plate sample but also for suspension. Raman spectra observed for titanium plate in high temperature water of 673 K and 25 MPa show growth of several Raman peaks with time up to 257 h. The peaks disappeared after cooled down to room temperature. The experimental results have demonstrated importance of in situ Raman spectroscopy.

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Oxide phonon spectra

Cited by 214 publications

References 0 publications

Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts

Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts

Bismuth‐Doped Ordered Mesoporous TiO₂: Visible‐Light Catalyst for Simultaneous Degradation of Phenol and Chromium

An in Situ Raman Spectroscopy System for Long-term Corrosion Experiments in High Temperature Water up to 673 K

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Oxide phonon spectra

Cited by 214 publications

References 0 publications

Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts

Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts

Bismuth‐Doped Ordered Mesoporous TiO2: Visible‐Light Catalyst for Simultaneous Degradation of Phenol and Chromium

An in Situ Raman Spectroscopy System for Long-term Corrosion Experiments in High Temperature Water up to 673 K

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Bismuth‐Doped Ordered Mesoporous TiO₂: Visible‐Light Catalyst for Simultaneous Degradation of Phenol and Chromium