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

Abstract Composition change during the melting process of some glasses in the PbBr 2 –PbCl 2 –PbF 2 –PbO–P 2 O 5 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 PbBr 2 , PbCl 2 and P 2 O 5 . The content of O is influenced by two factors. The incomplete decomposition of NH 4 H 2 PO 4 or the reaction between P 2 O 5 and H 2 O in the atmosphere increases the content of O, while the volatilization of P 2 O 5 decreases the content of O.