Dual role of ZnO and its impact on thermal and structural properties of tellurium-vanadate glass system

• Published in: Journal of non-crystalline solids 2024-10, Vol.641, p.123137, Article 123137
• Main Authors: Athokpam, Sushma, Fernandes, Brian Jeevan, Charan Prasanth, S, Ramesh, K., Ramesh, K.P., Mallikarjunaiah, K.J.
• Format: Article
• Language: English
• Subjects: FT-IR; Glass transition; Raman spectroscopy; X-ray diffraction; X-ray photospectroscopy
• ISSN: 0022-3093
• DOI: 10.1016/j.jnoncrysol.2024.123137

•xZnO-(60-x)TeO2–40V2O5 glasses are prepared and composition is verified through XPS study.•DSC analysis suggests that ZnO inclusion increased the system's cross-linking ability.•FT-IR and Raman analysis affirms the presence of TeO3, TeO3+1, TeO4, VO4 and VO5 groups.•Analysis revealed that as ZnO increased, its network formation changed from modifier to former. In the present study, we have reported the synthesis and characteristic properties of xZnO-(60−x)TeO2-40V2O5 (x = 20, 25, 30, 35, and 40 mol%) glass systems. The conventional melt-quenching method is adopted for the synthesis. The effect of ZnO concentration on the glass network has been studied using Raman and IR studies. The glass transition temperature (Tg) was found to increase with ZnO content. Structural analysis showed the presence of TeO4, TeO3+1 and TeO3 groups along with VO4 and VO5 coordinated vanadium groups. XPS analysis of oxygen (O 1s core level) spectra showed an initial increase in non-bridging oxygen by ∼ 62.27 %. However, it starts decreasing by ∼ 53.77 % with a further increase in ZnO content. The changes observed in the system are attributed to ZnO acting as a network modifier at lower concentrations however, as the ZnO content keeps increasing, it starts acting as a network former.