Composition analysis of glasses in the PbBr2–PbCl2–PbF2–PbO–P2O5 system

Composition change during the melting process of some glasses in the PbBr2–PbCl2–PbF2–PbO–P2O5 system melted at 450–470°C for 15 min was studied. Results show that there was a remarkable difference between the batch composition and the analyzed composition. Large amount of P, Br, Pb, and Cl were lost mainly in the form of PbBr2, PbCl2 and P2O5. The content of O is influenced by two factors. The incomplete decomposition of NH4H2PO4 or the reaction between P2O5 and H2O in the atmosphere increases the content of O, while the volatilization of P2O5 decreases the content of O.