Structural and optical properties of lithium borobismuthate glasses

• Published in: The Journal of physics and chemistry of solids Vol. 69; no. 9; pp. 2281 - 2287
• Main Authors: Moustafa, El Sayed, Saddeek, Yasser B., Shaaban, Essam R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.09.2008; Elsevier
• Subjects: A. Glasses; C. Infrared spectroscopy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; D. Optical properties; Disordered solids; Exact sciences and technology; Glasses; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Structure of solids and liquids; crystallography; 78.30.−j; 78.20.Ci; C. Infrared spectroscopy; 61.43.Fs; A. Glasses; D. Optical properties; 78.30.-j; Polarizability; Molar volume; Refractive index; Liquid state quenching; Glass structure; Infrared spectra; Density; Bismuthates; Borate glasses; Energy gap; Reflection spectrum; Optical properties; Lithium oxide; Absorption spectra
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2008.04.020

Glasses with compositions 25Li 2O–(75− x)Bi 2O 3– x B 2O 3, with 0⩽ x⩽30 mol%, have been prepared using the melt quenching technique. The density and the molar volume have been determined. IR spectroscopy is used as a structural probe of the nearest neighbor environment in the glass network. The optical transmittance and reflectance spectrum of the glasses have been recorded in the wavelength range 400–1100 nm. The values of the optical band gap E g opt for indirect transition and refractive index have been determined for 0⩽ x⩽30 mol%. The average electronic polarizability of the oxide ion α o 2− and the optical basicity have been estimated from the calculated values of the refractive indices. Variations in the different physical parameters such as the density, molar volume, optical band gap, refractive index, average electronic polarizability of the oxide ion and optical basicity with B 2O 3 content have been analyzed and discussed in terms of the changes in the glass structure.