XPS and 31P NMR inquiry of Eu3+-induced structural modification in SnO-containing phosphate glass
Document Type
Article
Publication Date
7-15-2018
Abstract
The influence of Eu3+ doping on the structural properties of SnO-containing phosphate glass has been investigated by X-ray photoelectron spectroscopy (XPS) and 31P nuclear magnetic resonance (NMR) spectroscopy. Oxygen 1s XPS data indicates that the Eu3+ doping results in a higher concentration of non-bridging oxygens in the glass matrix, whereas 31P NMR shows an increase in the terminal phosphate chain tetrahedral units, i.e. the amount of Q1 sites with only one bridging oxygen. Accordingly, both techniques agree with a depolymerization effect induced by the Eu3+ ions. Further, XPS reveals that together with the Eu3+ doping, the presence of Sn4+ is supported while the presence of Eu2+ is also indicated. The structural changes are then indicated to be a consequence of redox chemistry between Sn2+ and Eu3+ promoting a transition of tin from Sn2+ with a role as network former to Sn4+ acting as network modifier in the glass system.
Publication Title
Journal of Molecular Structure
Volume
1164
First Page
470
Last Page
474
Digital Object Identifier (DOI)
10.1016/j.molstruc.2018.03.095
ISSN
00222860
Citation Information
Jiménez, Fachini, E. R., & Zhao, C. (2018). XPS and 31P NMR inquiry of Eu3+-induced structural modification in SnO-containing phosphate glass. Journal of Molecular Structure, 1164, 470–474. https://doi.org/10.1016/j.molstruc.2018.03.095