New tellurite glasses with composition (in mol%): 60TeO2–(30-x)ZnO–5Bi2O3–5TiO2-xB2O3 (where x = 0, 2.5, 5.0, 7.5 and 10.0) were fabricated using conventional melt quenching method. Compositional dependence of the glasses on their density, thermal, refractive index and optical properties were investigated. X-Ray Diffraction analysis was carried out to confirm the nature of the thus formed glasses. Density, refractive index, and absorption spectra were measured at room temperature from which other glass characteristics such as polaron radius, oxygen packing density, field strength, B3+ interatomic distance, band gap energy, and Urbach tail were determined. Thermal characterisation to determine the change in glass transition temperature, glass crystallisation, melting point, and glass stability was carried out using Differential Scanning Calorimetry. A discussion was made in order to understand the results in terms of the ratio of bridging oxygen to non-bridging oxygen ions (BO/NBO). It was found that the addition of B2O3 results in increasing oxygen packing density, glass transition temperature, BO/NBO ratio and band gap energy, while decreasing density, refractive index, field strength, glass stability and Urbach tail energy. With increasing B2O3 concentration density changed from 5.879 to 5.646 g/cm3, refractive index 1.875 to 1.741, working temperature range (ΔT = 660C) and phonon energy within the range of 736 – 740 cm-1.
Borotellurite glasses with composition (in mol%): 57B2O3–20TeO2–15Bi2O3–3TiO2–(4-x)Na2O–1Tm2O3-xHo2O3 (where x = 0, 0.5, 1.0, 1.5, 2.0, and 2.5) have been fabricated and characterized aims at studying their density, molar volume and refractive index. Glasses were fabricated by melt quenching method. Density measurements were carried at room temperature using picnometer while their refractive indices were determined by applying Brewster angle method. It is observed that both density and molar volume tend to increase with increasing Ho3+ ions concentration. The density, molar volume as well as refractive index of the reported glass increases from 4.72 to 4.91 g/cm3, 31.80 – 32.18 cm3/mol, 1.4906 to 1.7253, respectively, with increasing holmium oxide (Ho2O3) concentration. Other properties characterized the glasses were also derived, including oxygen packing density, field strength and polaron radius.
Borate glasses with composition 50B2O3 – (25-x) Bi2O3 – 25ZnO – xTiO2 where x = 0, 1, 2, 3, 4 (mol%) were succesfully fabricated using a convensional melt-quenching technique aimed at tailoring glass suitable for a low loss optical fiber fundament. For this purpose, glasses were characterized for their density, refractive index, reflectance, UV-Vis absorption and FTIR spectra. Density measurement was carried out by applying Archimedes principle. Refractive index was measured using Brewster’s angle method. UV-Vis spectrum was recorded within the range of 200-1100 nm and FTIR measurement was measured at IR range. Combining the spectra data recorded both from UV-Vis–NIR and FTIR, the theoretical minimum loss of the glass was obtained. In addition, the band gap energy of the present glasses was also calculated. From these data, it can be derived many other glass properties such as Oxygen Packing Density (OPD), ionic radius, and polaron radius.
<p>This paper presents a comparison study of absorption spectra of borotellurite glasses with compostion: 20TeO<sub>2</sub> – 15Bi<sub>2</sub>O<sub>3</sub> – 3TiO<sub>2</sub> – (4-x) Na<sub>2</sub>CO<sub>3</sub> – 1Tm<sub>2</sub>O<sub>3</sub> - xHo<sub>2</sub>O<sub>3</sub> where x = 0; 0.5; 1; 1.5; 2; 2.5 (mol%). All glasses are fabricated using melt quenching method. Absorption spectra were recorded at room temperature in the spectral range of 200 – 1100 nm. Within this range, glass with x = 0 mol % of Ho<sub>2</sub>O<sub>3</sub> shows 2 absorption peaks which corresponds to electronics transition from <sup>3</sup>H<sub>6</sub> to state to <sup>3</sup>F<sub>3</sub> and <sup>3</sup>H<sub>4</sub>. For x = 0.5; 1; 1.5; 2; 2.5 (mol%), nine absorption peaks corresponding to electronics transition from <sup>3</sup>H<sub>6</sub> to state to <sup>5</sup>G<sub>5</sub>, <sup>5</sup>G<sub>6</sub>, <sup>1</sup>G<sub>4</sub>, <sup>1</sup>G<sub>4</sub>, <sup>5</sup>F<sub>3</sub>, <sup>5</sup>F<sub>4</sub>, <sup>5</sup>F<sub>5</sub>, <sup>3</sup>F<sub>3</sub>, and <sup>3</sup>H<sub>4</sub> are shown. It is shown that absorption at 680 nm and 790 are insensitive to the addition of Ho<sub>2</sub>O<sub>3</sub> in contrast to that at 580 nm and 650 nm.</p>
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