CdCl_2-PbCl_2-KCl(BaCl_2)和 BiCl_3-KCl-As_2S_3 系统玻璃化学稳定性的研究

A Study on the Chemical Durability of Glasses in the Systems of CdCl_2-PbCl_2-KCl(BaCl_2) and BiCl_3-KCl-As_2S_3

用动态离子选择电极法和原子吸收光谱法分别研究了以 CdCl_2和 PbCl_2为基的氯化物玻璃以及 BiCl_3KCl-As_2S_3系玻璃的化学稳定性,结果表明,CdCl_2和 PbCl_2基玻璃在水中的溶解过程分为两个阶段,首先是玻璃“网络”的解体,然后是组成“网络”的多面体本身的破坏,第二阶段比第一阶段缓慢得多;PbCl_2使CdCl_2基玻璃的化学稳定性得到显著改善。As_2S_3的引入可以显著地提高 BiCl_3-KCl 系统氯化物玻璃的化学稳定性,而 Bi—S 配位键的形成是产生这种效果的重要因素之一。

The chemical durability of the chloride glasses based on CdCl_2 and PbCl_2 andthe chemical durability of the glasses in the system of BiCl_3-KCl-As_2S_3 were studiedrespectively by dynamic ion selective electrode and atomic absorption spectrophoto-meter.The results show that the dissolving process contains two steps,the first isthe dissociation of the glass“network”,and the second is the dissociation of thepolyhedra that form the glass“network”,The second step is much slower than thefirst.It has been shown that the chemical durability of the glasses based onCdCl_2 can be increased by the introduction of PbCl_2.The chemical durability ofthe BiCl_3 system glasses can be improved by the introduction of AS_2S_3 becauseof the formation of Bi—S coordinate bond.