naa a22 4500 510804276 CHVBK 20180411083409.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s11664-013-2605-0 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2605-0 Mixed-Alkali Effect in Li2O-Na2O-K2O-B2O3 Glasses: Infrared and Optical Absorption Studies [Elektronische Daten] [M.A. Samee, A. Edukondalu, Shaik Ahmmad, Sair Taqiullah, Syed Rahman] The mixed-alkali effect (MAE) has been investigated in the glass system (40−x)Li2O-xNa2O-10K2O-50B2O3 (0mol%≤x≤40mol%) through density, modulated differential scanning calorimetry (DSC), and optical absorption studies. From the absorption studies, the values of the optical band gap (E opt) for direct transition and Urbach energy (ΔE) have been evaluated. The values of E opt and ΔE show nonlinear behavior with the compositional parameter. The density and glass-transition temperature of the present glasses also show nonlinear variation, supporting the existence of MAE. The infrared (IR) spectra of the glasses reveal the presence of three- and four-coordinated boron atoms. The specific vibrations of Li-O, Na-O, and K-O bonds were observed in the present IR study. TMS, 2013 Density nationallicence glasses nationallicence infrared spectroscopy nationallicence optical absorption nationallicence band gap energy nationallicence Urbach energy nationallicence mixed-alkali effect nationallicence Samee M.A. Department of Physics, Osmania University, Hyderabad, India aut Edukondalu A. Department of Physics, Osmania University, Hyderabad, India aut Ahmmad Shaik Department of Physics, Osmania University, Hyderabad, India aut Taqiullah Sair Department of Physics, Osmania University, Hyderabad, India aut Rahman Syed Department of Physics, Osmania University, Hyderabad, India aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/8(2013-08-01), 2516-2524 0361-5235 42:8<2516 2013 42 11664 https://doi.org/10.1007/s11664-013-2605-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2605-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Samee M.A. Department of Physics, Osmania University, Hyderabad, India aut NATIONALLICENCE 700 1- Edukondalu A. Department of Physics, Osmania University, Hyderabad, India aut NATIONALLICENCE 700 1- Ahmmad Shaik Department of Physics, Osmania University, Hyderabad, India aut NATIONALLICENCE 700 1- Taqiullah Sair Department of Physics, Osmania University, Hyderabad, India aut NATIONALLICENCE 700 1- Rahman Syed Department of Physics, Osmania University, Hyderabad, India aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/8(2013-08-01), 2516-2524 0361-5235 42:8<2516 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer