Abstract
Glasses in the system (65 − x)Bi 2O 3–15Li 2O–20GeO 2– xWO 3 (where x = 2, 5 and 10 mol%) were prepared by normal melt quenching method. The change in density and molar volume in these glasses indicates the effect of WO 3 on the glass structure. Fourier transform infrared (FT-IR) spectra show that these glasses are made up of GeO 4, GeO 6, BiO 6, BiO 3, WO 4 and WO 6 basic structural units. The structural units of BiO 6, GeO 6 and WO 6 increase with the increasing of WO 3 content. The optical constants of these glasses are determined over a spectral range, providing the complex dielectric constant to be calculated. Higher values for the refractive index and dispersion are recorded due to the high polarizability of bismuth and tungsten ions. The values of the optical band gap E g for all types of electronic transitions and refractive index have been determined and discussed. The dc conductivity measured in the temperature range 423–623 K obeys Arrhenius law. The dielectric constant ( ɛ′), dielectric loss (tan δ) and ac conductivity over a wide range of frequency and temperature, of the glasses were investigated.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
