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Problem statement: This study researched on different physical and optical properties of Nd 3+ doped soda-lime-silicate glass. The glasses containing Nd 3+ in (65-x)SiO 2 : 25Na 2 O: 10CaO: xNd 2 O 3 (where x = 0.0-5.0 mol%) had been prepared by melt-quenching method. The density and molar volume increase with increasing of Nd 2 O 3 concentration due to increasing of Non Bridging Oxygen (NBOs) in glass matrix. The optical spectra were measured and evaluated their optical band gap and found to decrease with increasing of Nd 2 O 3 concentration. Moreover, these results showed that the refractive index of glass does not only depend on the density but also depend on the electronic polarizability of the glass. The values of polarizability of oxide ions, theoretical optical basicity were also determined. Approach: This study investigated the effect of Nd 2 O 3 content on optical band gap, density, molar volume, optical basicity and polarizability in soda-lime silicate glass. Series of Nd 3+ doped soda-lime silicate glasses (in mol%): (65-x)SiO 2 -25Na 2 O-10CaO-xNd 2 O 3 (x = 1-5 mol%) were prepared by the normal meltquenching technique. Analytical reagent grade chemicals of SiO 2 , Na 2 O, CaO and Nd 2 O 3 were used in the glasses preparation. Each batch of chemical was powdered finely and mixed thoroughly in porcelain crucibles and was later melted in an electrical muffle furnace for 3 h, at 1200°C. After complete melting, the homogenized melt was quickly poured onto a stainless steel mould that was heated at 500°C to form the glasses. The glass blocks thus resulted were immediately transferred to the annealing furnace that and were annealed at 500°C for 3 h and then slowly cooled down to the room temperature in order to remove possible thermal stains in the glasses. Finally, the as-prepared glass samples were cut and then finely polished to a thickness of 3 mm. The glass densities were measured by using xylene as an immersion liquid based on the Archimedes's principle. Glass refractive indices were measured at room temperature using an Abbe refractometer (ATAGO) and mono-bromonaphthalene as an adhesive coating. The optical absorption spectra of Nd 3+ doped soda-lime silicate glasses were recorded at room temperature using a UV-VIS spectrophotometer (Hitachi, U-1800), working in 300-700 nm. Results: By addition of Nd 2 O 3 into the SiO 2 -Na 2 O-CaO glass network, the density increases with increase in Nd 2 O 3 content. The molar volume of the glass systems under study increases with increase in Nd 2 O 3 content, which is attributed to increase in the number of Non Bridging Oxygen (NBOs). The optical band gap slightly decreases with the increase of Nd 2 O 3 and results in the increase of bonding defect and non-bridging oxygen. The optical basicity of the glasses are increasing with Nd 2 O 3 content change with the increasing of polarizability and consequently the increase in refractive index. Conclusion: The study of SiO 2 -Na 2 O-10CaO-Nd 2 O 3 glass systems showed that the density and refractive index increase with...

This study reports on physical and optical properties of Dy 3+ doped bismuth borate glass. The glasses containing Dy 3+ in (70-x)B 2 O 3 :30Bi 2 O 3 :xDy 2 O 3 (where x = 0.0-2.5 mol%) have been prepared by melt-quenching method. In order to understand the role of Dy 2 O 3 in these glasses, the density, molar volume and optical spectra were investigated. The results show that molar volume of the glasses increase with the increasing of Dy 2

Soda-lime-silicate glasses in the compositions of (65-x)SiO2-25Na2O-10CaO-xHo2O3 (where x = 0.0, 0.50, 1.00, 1.50, 2.00 and 2.50 mol % ) were prepared by melt-quenching technique and characterized. The results show that, the absorption spectra of Ho3+ doped in soda-lime-silicate glass correspond with several bands, which are assigned from the ground state, 5I8 to 3H6 (360 nm), 5G4 (380 nm), 5G5 (417 nm), 5G6 (453 nm), 5F3 (479 nm), 5F4 (538 nm), 5F5 (639 nm), and 5I5 (880 nm). The refractive index and density of glasses were increase with increasing of Ho2O3 concentration. The color of glass samples is light amber with doped Ho2O3 in glass matrix.