Abstract: Sodium aluminophosphate glasses containing lithium ions of composition X Li2CO3 - (30-X) Na2 CO3- 60 NH6PO4 -10Al2O3 (where 20 ≤ x ≥ 5) have been prepared by melt quenching technique. The XRD spectra reveal the presence of no sharp peak confirms that the prepared glass samples were of an amorphous nature. The physical and optical properties of the glasses were investigated with the support of density and molar volume. The density of the glass matrix increases with lithium content and its molar volume shows non-linear variation. The metallic and non-metallic nature of the glass was predicted through the calculation of its physical properties. The optical properties of the prepared glass show mole fraction dependent and are mainly dependent on the basicity and polarizability of the Al2O3 content. The metallization criterion of the glass matrix clearly indicates the size of the conduction and valance band. Optical band gap values were found to decrease from 3.276 to 2.634 eV with aluminium content. The refractive index values were found to increase with lithium content in the glass samples. Inter-nuclear distance, field strength, oxygen packing density, polaron radius, transmission coefficient, reflection loss, dielectric constant and molar refraction were determined to study the physical properties of the glass matrix.

Keywords: borate, metallization criterion, XRD, optical band gap.

| DOI: 10.17148/IARJSET.2022.9291