Structure and some physical properties of PbO-P2O5 glasses

Glasses in the system xPbO·(100-x)P2O 5(x=25-60mol%) have been investigated using IR spectroscopy and by means of density and electrical-resistivity measurements. The infrared spectra revealed that for PbO<50mol% PbO enters the structure as a network modifier forming non-bridging oxygen ions. For PbO>50mol% PbO also plays the role of a network former. The greater rate of density increase for PbO>50mol% is due to the formation of PbO4 units. The conductivity of these glasses depends mainly on the mobility of Pb2+ ions. The variation of the electrical conductivity parameters upon changing the composition have been correlated with the structural changes in the glass matrix. All rights reserved.