Radiation induced optical absorption in lead borate glasses in relation to structure changes

PC 1966 07 149-156

The optical absorption band induced at about 1.5 eV (825 mp) by ionising radiation in lead borate glasses was studied; the effects of addition of cerium on the intensity of this band in glasses melted under various conditions suggested strongly that it is associated with an electron trap in the vicinity of Pb2+ ions. The intensity of this band increased with increasing lead content, reaching a maximum at about 25 mol. % PbO. The intensity of the 2.3 eV induced band increased with increasing PbO reaching maxima at about 33 and 45 mol. % PbO. It is postulated that the changes in intensity observed at about 25, 33, and 45 mol. % PbO are associated with structural changes at these compositions. Changes in infra-red absorption and molar volume supported this postulate.