Synthesis, Characterization, and Optical Properties of Titano-Molybdenum Phosphate Glasses

Melt quenching was used to prepare glasses of the 20Na 2 O–(40–x) Na 2 MoO 4 –xTiO 2 –40P 2 O 5 system (0≤x≤10 mol.%). Xray diffraction and thermal analysis by differential scanning calorimetry (DSC) were utilized to check for possible crystalline residues and the glassy state. Structural characterizations of these prepared glasses were realized by density, molar volume, and glass transition temperature (T g ). The data collected from the parameters of density and T g showed that their values depend on the glassy composition. Raman and infrared (IR) spectroscopies were used to investigate structural characterization. The compositions contain more water-resistant PO 3 2- (Q 1 ) and PO 4 3- (Q 0 ) units, according to glass durability testing. Using optical measurements, some parameters, such as optical band gap ( E g ) and Urbach energy (ΔE), have been evaluated. These parameters were developed in the opposite sense, where E g decreased from 2.35 to 1.85 eV and ΔE increased from 0.42 to 0.52 eV. This variation is associated with the production of non-bridging oxygens depending on the insertion of TiO 2 into glasses. Also, other parameters are determined by the UV-Visible absorption, and optical basicity ( A th ), electronic polarisability (α O2- ), and electronegativity (Δχ*) are decreased, respectively, from 0.9244 to 0.8877 eV, from 1.9976 to 1.9670 eV, and from 0.8064 to 0.7634 eV with an increase of TiO 2 mol.%. Graphical Abstract