摘要
本文从阳离子的配位数、化学键的特性等角度出发，探讨了PbI2－PbCl2－KCl三元系统的玻璃形成特性.并以DSC、SEM和XRD等为手段研究了组成为50PhI230PbCl20KCl（mol％）的玻璃的析晶行为.析晶动力学研究表明，所得玻璃的高、低温相变机理彼此不同.所得玻璃的析晶活化能接近于较稳定的氟锆酸盐玻璃，因此在析晶温度下表现出了较慢的析晶速率.通过适当的热处理;可以获得红外透过性能与原始玻璃一致的微晶玻璃，这种微晶化可大幅度地提高玻璃的显微硬度.加之，所得玻璃本身就具有良好的化学稳定性和优良的红外透过性能，因此有望以所得三元系统为基础，开发出一类具有实用价值的透红外玻璃材料.
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 consistent 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 glass based on our ternary system could be developed as one of promising inaterials for IR transmission.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第1期27-34,共8页
Journal of Inorganic Materials
基金
国家自然科学基金
关键词
非氟卤化物玻璃
玻璃
晶化
析晶行为
non-fluoride halde glass, IR transmitting materials, the preparation of glasses, glass formation behavior, crystallization Inechanisms, mechanical properties, IR transmitting properties
