Structural, Optical, Dielectric, and Defect Related Properties of In₂O₃Modified BaO-SiO₂ Glasses

Abstract

Glasses 40BaO-xIn₂O₃-(60-x)SiO₂, where x ranges from 0 to 10 mol%, were synthesized using a traditional melt quenching technique to investigate the impact of In₂O₃ addition to the glass network. The amorphous nature of glasses has been confirmed using XRD. The increase in density and corresponding decrease in molar volume have also shown that glass networks are compacted by adding In₂O₃. From IR and Raman spectra, significant changes have been identified for the silicate glass networks, which show that NBOs were altered using In₂O₃. The DSC spectra gave increased values for T_g and T_c, proving that the thermal stability increased in these samples. The UV-Vis measurements showed corresponding decreases in the optical bandgap, proving that the introduction of In₂O₃ increased disorder in the glasses. In addition, the Urbach energy also increased upon the introduction of In₂O₃. The PL spectra of the glasses showed intense visible emission peaks that increased in accordance with the concentration of In₂O₃.Electron spin resonance measurement confirmed that the increase of paramagnetic defects went on progressively. Dielectric studies showed frequency-dependent behavior, with the dielectric response being quite stable and with low loss at higher frequencies. These results show that In₂O₃ effectively tailors the structure and functional properties of BaO-SiO₂ glasses for optoelectronic and dielectric applications.