Preparation and optical properties of borate glass doped with MnO2

In this contribution, MnO₂ doped borate glass matrix with ratios 0.0, 0.5, 1.0, 1.5 and 2.0 wt% were prepared utilizing melting method. The structural characterization of these glass samples was performed via X- ray diffraction measurements. Optical absorption analyses within the 200–1000 nm wavelength range were performed to characterize the samples. The direct and indirect optical energy gaps (E_opt) decreased however Urbach energy (E_U) increased with increasing MnO₂ concentration. The refractive index, and optical conductivity values are observed to increase with increasing MnO₂ concentration. FTIR spectra of borate glass doped with 0.0, 0.5, 1.0, 1.5 and 2.0 wt% MnO₂ revealed the presence of absorption bands due to Mn²⁺.