EFFECT OF ADDING LEAD COMPOUNDS ON PROPERTIES OF SN-CL-P-O GLASSES

Low melting Sn-Cl-P-O glasses with glass transition temperature T-g=17 0-240 have been prepared. The effect of PbO or PbCl2 addition on the p roperties of these glasses have also been determined Lead compounds de crease the dissolution rate in water and thermal expansion coefficient while increasing the density, hardness, glass transition temperature and softening temperature. The effect of PbO addition on the increase of chemical durability is better than that of PbCl2 addition for these glasses. For the 45P(2)O(5).55SnCl(2) glass the dissolution rate in 3 3 degrees C water decreases from 1.8x10(-6) to 1.3x10(-8) g/cm(2) min with the addition of 15 mol% PbO. The increase in SnCl2 content also d ecreases the dissolution rate of the glass. The structure of glasses i s studied by XPS and FTIR spectroscopies to explain the relationship b etween glass properties and composition. The XPS and FTIR spectra indi cate the presence of P-Cl, Sn-Cl, Pb-Cl bonds and Pb-O-P linkages in t he short range glass structure.