Structural and Optical Properties of Niobium Doped Silver-Lead-Borate Glasses

Nb2O5 doped silver lead borate glasses with the chemical composition (29-x)PbO-1Ag(2)O-70B(2)O(3)-xNb(2)O(5) (where x=0.1mol % and 0.5 mol %) have prepared by conventional melt quenching method. FTIR and UV absorption technique have been used in order to obtain the information concerning network structure. As Nb2O5 concentration increased, the borate glass network is shown to change three coordinated to four coordinated boron system. SEM technique confines glassy nature of the prepared samples. The calculated optical band gap increases with increase Nb2O5 concentration.