Abstract: The glass formation bellavior of PbI₂-PbCl₂-KCl system was discussed in the view of coordination number and characteristics of chemical bonds. The crystallization behavior of 50PbI₂·30PbCl₂·20KC1(mol%) glass was investigated by means of DSC, SEM and XRD. The kinetic parameters of crystallization of the glass wcrc deternnnnned by nonisothermal methods. The results showed that the crystallization mechanisms corresponding respectively to two crystallization peaks in the DSC curve were different. The low crystallization rates at crystallization temperatures were attributed to high apparent activation energies, closing to the values obtained from the relatively stable fluorozirconate glass. It was found that the IR transmitting property of the glass-ceramic obtained under suitable heat treatment conditions was consistert with that of the original glass. The microhardness of the glass-ceramic could also be greatly improved. Moreover, the glass synthesized in this work had good chemical durability and excellent IR transmitting properties, so multicomponent galss based on our ternary system could be developed as one of promising materials for IR transmission.

Key words: non-fluoride halde glass, IR transmitting materials, the preparation of glasses, glass formation behavior, crystallization Inechanisms, mechanical properties