Abstract
The local structure of vanadate glasses containing SrO with the nominal composition [(SrO) x (V 2O5) 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 3p 3/2 and Sr 3p 1/2 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 VOV environment called bridging oxygen (BO) and the other from oxygen atoms in an SrOV 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+/V total], 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.
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More From: Journal of Electron Spectroscopy and Related Phenomena
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