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为了研究PbO-PbBr2-PbF2-P2O5系统玻璃在熔化过程中成分的变化，本文应用定量化学分析法测出了玻璃在熔化后的成分. 结果表明，PbO-PbBr2-PbF2-P2O5系统玻璃熔化时氟和磷的损失较大，铅的损失相对较小; 溴的损失随配料中各元素含量的多少而变化. 氧含量的变化受P2O5的挥发以及氧、水分与玻璃熔体中卤化物的反应程度两个因素影响. 相关化学反应的热力学计算与分析结果相吻合.“,”To study the composition change during melting of PbO-PbBr2-PbF2-P2O5 system glass, the quantitative chemical analysis was complied to measure the composition of the glass after melting. The results show that the loss of lead during melting is mainly ascribed to the volatilization of PbBr2. When a sample contains a high content of phosphorus and a low content of fluorine, the loss of bromine and phosphorus is remarkable, mainly in the form of PBr3. On the other hand, if a sample contains a high content of fluorine and a low content of bromine or a low content of phosphorus, bromine will not lose much while a large amount of phosphorus and fluorine are lost during melting, mainly in the form of PF5. The reaction between phosphorus and fluorine is much easier than that between phosphorus and bromine. The results of thermodynamic calculation are consistent with the above results and discussions. The content of oxygen is influenced by two factors. Volatilization of P2O5 decreases the content of oxygen, while the reaction between oxygen or water in air and halides in melts increases the content of oxygen.