Influence of In2O3 on Optical, EPR, and Structural Properties of Barium Borate Glasses Containing Cu2+ Spin Probe

To evaluate the effect of In2O3 on (30-x) BaO-69B2O3-xIn2O3-1CuO (x = 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) glasses are described for their spectroscopic properties as well as physical and optical qualities. Bragg’s peak-free X-ray diffractograms confirmed the samples’ non-crystalline character. The increase of In2O3mole percent in the glasses has caused non-linear fluctuations in the physical parameters such as density and molar volume. Urbach energy measurements and optical band gaps have shown modest inflections with In2O3 composition. The 2B1g → 2B2g transition is responsible for the broad distinctive absorption band seen in optical absorption spectra caused by the Cu2+ spin probe. The spin-Hamiltonian parameters’ non-linear variation with indium oxide content suggests that the ligand field strength surrounding Cu2+ ions in glass samples has changed. Bonding parameter values are determined using EPR and optical absorption spectrum data, and it is discovered that they are ionic in nature. According to FTIR tests, when the amount of indium oxide in the glass grew, a small percentage of BO3 units were converted into BO4 units. Indium oxide in these glasses appears to generate notable modifications in the electrical conduction, transparency, and semiconducting behavior, according to the behavior of their optical, physical, and spectroscopic qualities.