The Estimation of Oxide Polarizability using the Electronegativity for Li2O:B2O3:SiO2 Glass System

Glass samples of the Lithium borosilicate 42.5Li2O? (57.5-x) B2O3-xSiO2, x=0-57.5 in the step of 5,7.5,10,20, were prepared by conventional melt-quench technique. The density and molar volume of some silicate glasses were determined in order to study their structure. Molar volume decreases linearly as mole % of B2O3 decreases. The refractive index and the energy gap, which have remarkable correlation. Molar refraction Molar polarizability, Average elecrtonegativity also decreases linearly as mole % of B2O3 decreases; except for B2O3 and SiO2 they are smaller. In the present study, the electronic oxide polarizability of prepared ternary oxide glasses has been estimated on the basis of average optical electronegativity. The value of the oxide ion polarizability α 0-2(Dimitrov), α 0-2(Reddy), oxides ion polarizability as a function of refractive index α o- 2(Dimitrov & Sakka ) , has a good correlation between them. The basicity, Λ(Duffy & Ingram) and Λ(Reddy) determined by using the average electronegativity shows increasing behavior with increasing mol % of SiO2; The values of basicity has a good correlation between them, except for B2O3 and SiO2 they are larger in Λ(Duffy & Ingram). The present research is another trend of the oxide ion polarizability and basicity determination for ternary glasses.