Effect of Ce4+ and Ce4+ in boro-tellurite based glass on optical and structural properties

Enhancement of optical and structural properties of rare earth ions doped boro-tellurite glasses with high density modifiers become a new approach to achieve Innovative optical glass devices. Motivated by this idea, three glass samples with the composition of [(Te02) o7 (Bi203) o.25, and 98 (Ce02)002 were successfully synthesized by conventional melt quenching method. A small amount ofCe02 can enhance the glass density. The presence of Ce 3 + and Ce4+ ions from Ce02 assist in a compaction of the glass network which affects the result in density and molar volume. The absence of a sharp peak in X-ray Diffraction (XRD) spectra confirmed that all glass samples in this work ate in an amorphous nature. Based on Fourier Transform Infrared Spectroscopy (FTIR) analysis, most of the glass samples consist ofTe03, Te04, B03 and B04 structural units. The Increase in refractive index value is also due to the presence of Ce 3 + and Ce4 + ions in the glass network which leads to dense packing and is also affected by the Increment in both electronic polarizability and optical basicity. The Urbach energy value continuously decreased after the addition of 0.02 mol Ce02 signifies the reduction of defect concentration in the glass network. This in turn causes the reduced fragility nature of the glass and produces glass with high stability and connectivity.