Abstract
This research studied optical and structural properties of SrO–Nb 2O 5–P 2O 5 glasses containing 0 ~ 25 mol% Nb 2O 5 and 35 ~ 60 mol% SrO using spectra of UV–Vis, FTIR and XPS. Our aim was to work new moldable glasses which are colorless with high refractive index and transmittance, and their correlation with glass structure. Nb 2O 5 plays the role as an intermediate of glass formation, and transforms the role to network-former or glass-modifier depending on composition. Refractive index increases monotonically with Nb 2O 5 content at the expense of transmittance, and specific coloring which occurs in ternary compositions with the ratio P 2O 5/SrO > 1. This effect arises from much increased [Nb 3+ and Nb 4+] fraction, as quantitatively deconvoluted in Nb3d XPS spectra, in the ligand [NbO 6] octahedral which is supported by FTIR and O1s XPS spectra. As the ratio P 2O 5/SrO ≤ 1, Nb 2O 5 is more of a network former and [NbO 6] octahedral structure turns into [NbO 4] tetrahedron with partial Nb–O…(Sr) bonding turns into (Nb–O–Nb) tetrahedron, coloring disappears.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
