A comprehensive review of structural, and optical properties of boronated glasses doped with 3-d transition metal oxides (TMOs)

In this article, recent advancements in the glass industry have been focused on doping transition metal oxides (TMOs) in boronated glass, which substantially enhance their performance and cost-effectiveness. Boronated glasses are a non-crystalline material containing a long-range disorder framework of the network. Crystallization of the glasses is seen due to the greater amount of TMOs in the system. The modification of borate networks with the addition of the TMOs is reported as a significant change in the glass network as a former and modifier. The balanced ratio of BO₃ and BO₄ units with TMOs affected the glass network stability, thermal resistance, and chemical durability. The variable valency of TMOs and d-d transition affected by the ligand field effect, allows them to change oxidation states with their unique absorption band in the UV–visible spectra. The tuneable optical properties of the glasses such as optical band gap, refractive index, and Urbach energy make them optimal for applications in optical storage devices, electro-optical devices, lasing medium, and optical switching devices. The TMOs exhibit magnetic and magneto-optic properties that make them eligible for optical sensors, isolators, and magneto-optical data storage devices. This tunability enables the glass towards the fabrication of smart windows, solar energy harvesters, optical filters and optical amplifiers for solid-state lasers.