What is it about?
An advanced solid-state NMR protocol is developed for characterising the structural role of Nb2O5, an important intermediate oxide, in multicomponent glasses. The new strategy is applied to glasses in the model Nb2O3-NaPO3 system. The results provide the composition dependence of the phosphorus speciation, i.e., the relative proportions of P-O-P, P-O-Nb and P-NBO connections, where NBO refers to a non-bridging oxygen atom. They also show that six-coordinated niobium is found in a variety of distorted environments. The results portray niobium to be in a network former role.
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Why is it important?
The results of this work delineate a general advanced NMR strategy for exploring the structural features of other intermediate oxides in multiple-component glasses, including more complex glasses of technological interest.
Perspectives
It was fascinating to find that the pieces of information obtained from a plethora of advanced solid-state NMR methods could be used to provide sufficient constraints for a self-consistent deconvolution of the 31P MAS NMR spectra.
Professor Philip S Salmon
University of Bath
Read the Original
This page is a summary of: Structural Role of Nb2O5 in Phosphate Glasses: An Advanced Solid-State NMR Protocol for the Glass System xNb2O5–(100–x)NaPO3, Journal of the American Chemical Society, August 2025, American Chemical Society (ACS),
DOI: 10.1021/jacs.5c09793.
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