Abstract
90%[xB(2)O(3) (1-x) P2O5] 10%Fe2O3, glass systems where (x = 0 mo1%, 5 mol%, 10 mol%, 15 mol%, 20 mol%) was prepared via a melt quenching technique. The structure of glass is investigated at room temperature by, Raman and EPR spectroscopy. Raman studies have been performed on these glasses to examine the distribution of different borate and phosphate structural groups.
We have noted an increase from 3 to 4 in the coordination number of the boron atoms from 3 to 4, i.e., the conversion of the BO3 triangular structural units into BO4 tetrahedra.
The samples have been investigated by means of electron paramagnetic resonance (EPR). The results obtained from the g(ef) = 4.28 EPR line are typical of the occurrence of iron (III) occupying substitutional sites.
Moreover, the dielectric sizes such as epsilon'(omega), epsilon ''(omega), imaginary parts of the electrical modulus, M-center dot(omega) and the loss tan delta, their variation with frequency at room temperature show a decrease in relaxation intensity with an increase in the concentration of (B2O3). On the present work, we have found a weak extinction index with our new glass. (C) 2013 Published by Elsevier B.V.