PbI_2-PbBr_2-AgI系统玻璃的化学稳定性研究  

Chemical Durability of a PbI 2 PbBr 2 AgI Glass

作　　者：金政武 程继健[1] 

机构地区：[1]华东理工大学无机材料系

出　　处：《华东理工大学学报（自然科学版）》1997年第3期343-348,共6页Journal of East China University of Science and Technology

基　　金：国家自然科学基金

摘　　要：在２５°Ｃ恒温下，研究了摩尔分数组成为０．５０ＰｂＩ２·０．３０ＰｂＢｒ２·０．２０ＡｇＩ的玻璃在静态去离子水中的侵蚀过程。由于玻璃中溶出的ＰｂＸ２（Ｘ＝Ｉ，Ｂｒ）发生水解，侵蚀液的ｐＨ值经历一个由快速下降到逐渐稳定的变化过程。诱导期过后，玻璃中的各组分以分子化学比形式溶解，这是一个选择性溶解过程，溶解度较高的组分将优先溶解。溶液分析结果表明，玻璃的侵蚀是一个扩散控制的过程。引入难溶组分是提高非氟卤化物玻璃化学稳定性的关键。本系统玻璃的化学稳定性优于不含ＬａＦ３的氟锆酸盐玻璃。The leaching process of 0.50 PbI 2· 0.30 PbBr 2· 0.20 AgI glass in static de ionized water was studied at a constant temperature 25°C. The pH of solution was decreased to a constant value after an initial rapid drop, and this pH drift behavior was attributed to the hydrolysis reactions of dissolved PbX 2(X=I,Br) in the solution. After an initial induced period, the components of the glass entered into solution as halides without a prior hydroxylation step, and it was a selective dissolving process that the leaching rate of each component in the glass was proportional to its solubility. The analysis results of solution showed that the corrosion process was controlled by the interdiffusion of leaching agents and dissolving species through the porous corrosion layer and the crystal deposition layer. The key of improving the chemical durability of non fluoride halide glasses is to introduce less soluble components into the glasses. The chemical durability of PbI 2 PbBr 2 AgI glasses was proved to be superior to that of fluorozirconate glasses without LaF 3 content. It is hopeful for the glasses based on studied system to be developed as promising IR transmitting materials.

关 键 词：非氟卤化物玻璃 化学稳定性 卤化物玻璃 

分 类 号：TQ171.716[化学工程—玻璃工业]