Abstract
Problem statement: Systematic series of ZnO-TeO 2 glasses with mole fraction of 0.10-0.40 ZnO content with an interval of 0.05 were studied t o obtain their physical and optical properties. Approach: All the glass samples were synthesized by rapid me lting quenching method under controlled conditions, while their refractive indic es (n) were measured by the EL X-02C high precision ellipsometer. The room temperature absorption of al l glass samples were determined using Camspec M350 double beam UV-visible spectrophotometer. The infrared (IR) spectra of each glass samples were recorded with Thermo Nicolet Fourier Transform-Infrared (FT-IR) spectrophotometer. Their physical properties were measured and the amorphous nature was confirmed by the x-ray diffraction technique. Results: The increase of refractive index of the TeO 2-ZnO glasses with the addition of ZnO was best explained in terms of either electron dens ity or polarizability of the ions. The absorption e dge shift to higher energy (shorter wavelength) with in creasing ZnO content was observed in this glass. The optical band gap (E opt ) of zinc tellurite glass decreases with increasing of ZnO content probably due to the increment of Non-Bridging Oxygen (NBO) ion contents which eventually shifted the band edge to lower energies. Conclusion/Recommendation: The physical and optical properties of zinc tellurite glasses were found generally affected by the changes in the glass composition. FTIR spectra of zinc tellurite glass revealed broad, weak and stron g absorption bands in the investigated range of wav e numbers from 4000-400 cm -1 which associated with their corresponding bond modes of vibration and the glass structure. The addition of ZnO into Te O 2 glass network shifted the major band from 626 cm -1 (for pure TeO 2 glass) to the band at around 669 cm -1 .
Highlights
Tellurite glasses have been intensive studied because of their technological and scientific importance
This study reports our work on the investigation of the physical and optical properties of binary zinc tellurite glass system
The physical and optical properties of zinc tellurite glasses were found generally affected by the changes in the glass composition
Summary
Tellurite glasses have been intensive studied because of their technological and scientific importance Such amorphous materials are candidates for new optical materials because of their superior properties, such as high refractive index, high dielectric constants, a wide band infrared transmittance and large third order non-linear optical susceptibility[1,2]. They posses relatively low transformation temperatures, high densities and non hygroscopic properties, which limit the application of phosphate and borate glasses[3,4]. The TeO2-ZnO system shows good and stable glass-forming ability with a broad region. The above mentioned indicate undoubtedly the existence of a practical interest in the zinc-tellurium containing systems as a choice of compositions for super heavy optical flint glasses[1,4]
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