Abstract: A series of PbBr 2 PbCl 2 P 2O 5 glasses have been prepared and characterized to research the effect of melting temperature on the properties of glasses. The glass forming regions have been explored and the stability of the glasses against crystallization studied. The density, characteristic temperatures, chemical analysis compositions, and infrared absorption spectra of the glasses were measured. Results show that the PbBr 2 PbCl 2 P 2O 5 ternary system melted at 530～540℃ has a broader glass forming region which extended to the side of PbBr2 than that melted at 450～470℃. The glass transition temperature is more than 200℃ and the density is more than 5 5 g·cm 3 . Both the chemical analysis composition and the infrared absorption spectra of some glasses melted at 530～540℃ show that the decomposition of NH 4H 2PO 4 is more complete than that of glasses melted at 450～470℃.

Key words: phosphate glasses, melting temperature, property