Glasses of the form, (0.40-x)Na2O-xPbO-0.60P2O5 (x = 0 to 0.40), were prepared by using a conventional melting procedure and their density, molar volume, glass transition temperature, ionic conductivity and infra-red spectra were investigated. It was found that the density and thermal stability increased upon substituting PbO for Na2O. The ionic conductivity increased substantially with increasing Na2O concentration and decreased with increasing PbO content. Fourier-transform infra-red spectroscopy revealed the formation of P---O---Pb bonds in the glasses. The formation of P---O---Pb bonds, which replaced P---O-...Na+ bonds, was in accord with variations in the glass transition temperature, molar volume and ionic conductivity.

Structure and DC Conductivity of Lead Sodium Ultraphosphate Glasses. M.Abid, M.Et-tabirou, M.Taibi: Materials Science and Engineering B, 2003, 97[1], 20-4