• B Eraiah

      Articles written in Bulletin of Materials Science

    • Optical properties of samarium doped zinc–tellurite glasses

      B Eraiah

      More Details Abstract Fulltext PDF

      Glasses with the composition, (Sm2O3)𝑥(ZnO)(40–𝑥)(TeO2)(60), were prepared by conventional melt quenching method. The density, molar volume, and optical energy band gap of these glasses have been measured. The refractive index, molar refraction and polarizability of oxide ion have been calculated by using Lorentz–Lorentz relations. Optical absorption spectra of these glasses were recorded in the range 300–700 nm at room temperature. The oxide ion polarizabilities deduced from two different quantities, viz. refractive index and optical energy band gap, agree well compared with other glasses. The nonlinear variation of the above optical parameters with respect to samarium dopant has been explained.

    • Optical properties of lead–tellurite glasses doped with samarium trioxide

      B Eraiah

      More Details Abstract Fulltext PDF

      The optical properties of a new family of 𝑥Sm2O3–(40–𝑥)PbO–60TeO2 glasses are investigated. The optical absorption spectra were recorded at room temperature in the UV-visible region. From the absorption edge studies, the values of optical bandgap energies have been evaluated. The refractive index, molar refraction and polarizability of oxide ions have been calculated by using Lorentz–Lorentz relations. The non-linear variations of the above optical parameters are discussed with respect to samarium concentration.

    • Optical properties of zinc–vanadium glasses doped with samarium trioxide

      B Eraiah

      More Details Abstract Fulltext PDF

      Zinc–vanadium glasses doped with samarium oxide having the chemical composition Sm2O3(𝑥) ZnO(40-𝑥)V2O5(60) (where 𝑥 = 0.1–0.5 mol%) were prepared by melt quenching method. The density of these glasses was measured by Archimedes method; the corresponding molar volumes have also been calculated. The values of density range from 3.7512 to 5.0535 gm/cm3 and those of molar volume range from 28.3004 to 37.6415 cm-3. The optical absorbance studies were carried out on these glasses to measure their energy bandgaps. The absorption spectra of these glasses were recorded in UV–Visible region. No sharp edges were found in the optical spectra, which verify the amorphous nature of these glasses. The calculated optical bandgap energies of these glasses were found to be in the range of 0.3173–0.6640 eV. The refractive index and polarizability of oxide ion have been calculated by using Lorentz–Lorentz relations. The values of refractive index range from 1.1762 to 1.2901 and those of polarizability of oxide ion range from 1.6906 × 10-24 to 2.2379 × 10-24 cm3.

    • Influence of europium (Eu3+) ions on the optical properties of silver lead borate glasses

      K Keshavamurthy B Eraiah

      More Details Abstract Fulltext PDF

      The influence of europium (Eu3+) ions on the optical properties of silver lead borate glasses of the 𝑥Eu2O3–(1 – 𝑥)Ag2O–29PbO–70B2O3 (𝑥 = 0, 0.1, 0.2, 0.3, 0.4 and 0.5 mol%) glass system prepared by the conventional melt quenching technique and their physical and optical properties were investigated. The UV absorption spectra were recorded at room temperature in the wavelength range of 200–600 nm. From the absorption edge data, it is found that both the direct and indirect transitions and their values are ranging from 3.19 to 3.54 and 2.50 to 3.07 eV, respectively. The Urbach energy values for these glasses were found to be in the range of 0.39–0.52 eV. The refractive indices have also been evaluated with respect to different molar concentrations of Eu2O3 and their calculated values are ranging from 1.598 to 1.654.

  • Bulletin of Materials Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.