Bismuth based quaternary glasses with compositions BiBLM: 50Bi₂O₃–20B₂O₃–15Li₂O–15MO (where MO = ZnO, CdO, BaO, and PbO) were processed by conventional melt quenching. The effectiveness of various modifier oxides on the optical and structural properties of the developed glasses was studied systematically by XRD, DSC, FTIR, Raman, and optical absorption (OA) measurements. The synthesized glass specimens were characterized by XRD and the patterns demonstrated an amorphous nature. The physical characteristics such as molar mass, density, and OPD values were found to increase with an increase in the molar mass of the modifier oxides, while there was a decrement in oxygen molar volume, thus resulting in decrement of complete molar volume of the prepared glasses. From DSC analysis, incorrigible reduction and enhancement of T_g and thermal stability among various modifier oxides in the glass network was noticed. Optical absorption data for glass specimens have confirmed the decrease in both direct and indirect optical band gap values among various modifier oxides incorporation. These investigations support the obtained Urbach energy (UE) and metallization criteria of synthesized glasses. The ionic characteristic for the glass specimens were confirmed by the values of electronic polarizability and electronegativity. The Raman and FT-IR spectra of the glass specimens displayed the existence of BiO₃, BiO₆, ZnO₄, CdO₄, BaO₄, BO₃, PbO₄, and BO₄ structural units within the glass matrix. These structural results can support the applications of as-developed glasses in the area of photonics.

FTIR and the electron spin resonance studies on 59B₂O₃-10As₂O₃-(30 - x)PbO-xBaO (x = 0, 7.5, 15, 22.5, 30 mol %) glasses containing 1 mol % V₂O₅, or MnO₂ have been carried out. The ESR spectra of V⁴⁺ ion in the glass system were recorded at X-band frequencies at 300 K. The V⁴⁺ ion in the present glass system exists as VO²⁺ ion in octahedral coordination with tetragonal compression. The site symmetry of vanadyl is C_4v and the ground state of 3d ¹ ion is d _xy . The spin-Hamiltonian parameters (g _‖, g _⊥ and A _‖) of VO²⁺ ions in the present glasses have been estimated. The spectra consist of resonance lines centered at g ≈ 4.3 and g ≈ 2. The resonance line centered at g ≈ 4.3 has been attributed to the rhombic symmetry of the Mn²⁺ ions. The resonance signal at g ≈ 2 is attributed to the Mn²⁺ ions in an environment close to an octahedral symmetry. The absence of boroxol ring in the present glass system suggested that these glasses consist of randomly connected BO₃ and BO₄ units. The conversion of BO₃ to BO₄ takes place in the glasses under investigation.