Study on structure and properties of La2O3–TiO2–B2O3 system glass

• Published in: Journal of non-crystalline solids 2024-07, Vol.635, p.123006, Article 123006
• Main Authors: Zhu, Hanzhen, Wang, Yanhang, Liu, Jiayu, Yang, Penghui
• Format: Article
• Language: English
• Subjects: Glass structure; La2O3–TiO2–B2O3 glasses; Refractive index; Titanium dioxide
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2024.123006

•The main structural unit of Ti in La2O3–TiO2–B2O3 system glass is [TiO5] polyhedral, with some [TiO4] and [TiO6] polyhedral.•The incorporation of TiO2 results in a reduction of the [BO4] groups in La2O3–TiO2–B2O3 system glass.•20 % of Ti(Ⅳ) ions are reduced to Ti(Ⅲ) ions in the La2O3–TiO2–B2O3 system glass.•The optical properties of La2O3–TiO2–B2O3 system glasses can be controlled by varying the TiO2 content. High refractive index La2O3–TiO2–B2O3 (LTB) system glasses have been successfully prepared by traditional melt-quenching method. Based on XPS results, we acquire details regarding the Ti oxidation state, coordination environments of boron and titanium, and the ratio of bridging to non-bridging oxygens within the glass. The predominant structural units identified in the glass matrix include [BO4], [BO3] and [TiO5] polyhedra, alongside a fraction of [TiO4] and [TiO6] polyhedra. The incorporation of TiO2 results in a reduction of the [BO4] tetrahedral groups and an increase of bridging oxygens and non-bridging oxygens bonds with Ti within the glass structure. 20 % of Ti(Ⅳ) ions in the glass are reduced to Ti(Ⅲ) ions. The addition of TiO2 content leads to an increase in Vickers hardness and refractive index of the glass, with [TiO5] polyhedra notably enhancing the refractive index. However, the increase in TiO2 content correspondingly decreases glass transmittance due to the charge transfer between Ti4+ or Ti3+and O2−.