Structural Study on Lithium-Barium Borophosphate Glasses Using Infrared and Raman Spectroscopy

Abstract

This paper reported on the structural properties of Lithium-Barium borophosphate glasses. The glasses were prepared through melt quenching technique and studied in the compositional series which was 25Li2O:25BaO:(x)B2O3:(50-x)P2O5where 0x50 mol% .The aims of this work were to investigate the vibration mode about the local order around phosphorus tetrahedral structures and the boron coordination changed from trigonal to tetrahedral structures. Their basic properties were determined and their structure was studied by Fourier Transform Infrared (FT-IR) and Raman spectroscopy. Both spectroscopy analysis of the sample revealed vibration mode related to the characteristic phosphate bonds and borate bonds especially P-O-P, O-P-O ,P-O-B, BO3and BO4. Structural studies were devoted to the investigation of changes in boron coordination in the dependence on changes in B2O3or P2O5ratio in the borophosphate glasses. The decrease in the strength of the vibrations of the non-bridging PO2groups seems to indicate a progressive increase in the connectivity of the glass with increasing B2O3content. It was likely that this connectivity was due to the formation of P-O-B links at 890 cm-1, which replaced the vibration mode P-O-P. The increasing of B2O3content and decreasing the P2O5content causes the boron coordination changes from trigonal to tetrahedral and the basic units change from BO3to BO4. Overall, the high frequency bands corresponding to stretching vibration become broader, less distinct and overlap each other with an increasing B2O3content and decreasing P2O5content.

Influence of Eu³⁺ dopant on physical and optical properties of lithium-borosulfophosphate glasses

“…Density measurements were made by using standard Archimedes method with toluene as immersing fluid (Hua et al, 2013, Wong et al, 2014, Reddy et al, 2016. The optical absorption spectra for all Eu3+-doped samples were obtained at room temperature using Shimadzu 3101 UV-Vis-NIR spectrophotometer in the range of 200 -2400 nm.…”

“…In general, any glass hosts doped with rare earth ions has been a key to the development of several optical devices such as visible and infrared solid-state lasers, Light-emitting diodes (LEDs), optical amplifiers, sensors to mention but a few owning to their unique features such as high refraction with relatively low dispersion, high visible emission efficiency, inhomogeneous line width, stable oxidation state and several excited states for optical pumping (Janek et al, 2016). These unparallel features and the prominent applications of rare earth doped glass materials piloted our research interest in the study of their physical and optical characteristics.…”