Local structure and redox state of vanadium in strontium-vanadate glasses

G. D. Khattak, Nouar Tabet

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The local structure of vanadate glasses containing SrO with the nominal composition [(SrO)x (V2O5)1-x], where 0.2 ≤ x ≤ 0.5, have been investigated by X-ray photoelectron spectroscopy (XPS). The core-level binding energies of V 2p, Sr 3p and O 1s have been measured. The doublet peaks attributed to Sr 3p3/2 and Sr 3p1/2 in the Sr 3p spectra have essentially the same binding energies for all glass samples, regardless of the composition The O 1s core level spectra, however, show slight asymmetry for the glass samples with x = 0.2 and 0.3 which results from two contributions, one from the presence of oxygen atoms in the V-O-V environment called bridging oxygen (BO) and the other from oxygen atoms in an Sr-O-V and V = O environment called non-bridging oxygen (NBO). For samples with x = 0.4 and 0.5 the O 1s spectra were symmetric indicating the existence of only one type of oxygen configuration (NBO). There is a good agreement between the measured (XPS) and calculated values for NBO/TO. The quantitative ratio, [V 4+/Vtotal], for each glass sample, has been determined from the analysis of the V 2p core level spectra. The ratio remains practically constant independent of vanadium concentration within experimental uncertainties.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume136
Issue number3
DOIs
Publication statusPublished - 1 Jun 2004
Externally publishedYes

Fingerprint

Vanadium
Strontium
Vanadates
vanadates
strontium
vanadium
Oxygen
Glass
glass
oxygen
Core levels
oxygen atoms
binding energy
photoelectron spectroscopy
Binding energy
X ray photoelectron spectroscopy
Atoms
x rays
Oxidation-Reduction
asymmetry

Keywords

  • Bridging oxygen
  • Non-bridging oxygen
  • Oxide glasses
  • Transition metal oxide
  • XPS

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Local structure and redox state of vanadium in strontium-vanadate glasses. / Khattak, G. D.; Tabet, Nouar.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 136, No. 3, 01.06.2004, p. 257-264.

Research output: Contribution to journalArticle

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