PbBr_2-PbCl_2-PbF_2-PbO-P_2O_5系统玻璃形成特性的研究

GLASS FORMATION IN THE PbBr2-PbCl2-PbF2-PbO-P2O5 SYSTEM

研究了ＰｂＢｒ２－ＰｂＣｌ２－ＰｂＦ２－ＰｂＯ－Ｐ２Ｏ５系统的玻璃形成能力和系统的玻璃形成区，测试了一些玻璃的特征温度．结果表明：加入５％（摩尔分数，下同）ＰｂＯ和５％ＰｂＦ２都使玻璃转变温度升高，玻璃形成区缩小，并向ＰｂＢｒ２方向偏移；同时加入２．５％ＰｂＯ和２．５％ＰｂＦ２同样提高了玻璃转变温度，但却增大了玻璃形成区；继续提高ＰｂＯ和ＰｂＦ２的加入量，玻璃形成区显著减小．

A series of new glasses in the PbBr2-PbCl2-PbF2-PbO-P2O5 systems were prepared and characterized. The glass_forming regions were studied and the stability of the glasses against crystallization was also studied. Results show that the PbBr2-PbCl2-P2O5 ternary system has a broad glass_forming region which extends down to 30% (in mol) P2O5. Most of the glasses in this system show strong stability against crystallization and have glass transition temperatures as low as 146 . When 5% PbO or 5% PbF2 is introduced into the PbBr2-PbCl2-P2O5 system, the glass_forming regions become smaller and the glass transition temperature is higher. The introduction of 2.5% PbF2 and 2.5% PbO into the ternary system glass increases the glass transition temperature and broadens the glass_forming region.