摘要
使用DTA、IR光谱、Raman光谱、光电子能谱、XRD、SEM和EDAX等分析方法研究了一种组成的CaF2-Al2O3-SiO2系玻璃的结构，发现玻璃的结构是由［SiO4］和［AlO4］以顶角相连的方式构成基本网络骨架，Ca2＋处于网络间隙，F-有一部分取代O2-进入玻璃网络，另一部分停留在网络间隙，Al3＋也有一部分处于网络间隙．F-取代O2-进入玻璃网络，削弱了玻璃的网络结构，使玻璃发生了分相，其中一相富含Si4＋和Al3＋，另一相富含Ca2＋和F-，热处理时，CaF2晶体首先从这一相中析出．
The structure of CaF2-A12O3-SiO2 system glass was investigated by using the methods ofDTA, IR, Raman, XPS, XRD, SEM and EDAX. It was found that the structure units, [SiO4] and[AlO4], were linked to form the basic network by means of angle connection and the ions Ca2+ werelocated as the network modifiers. Some ions F- entered as the network formers through replacingO2-, and other ions F- were located as the network modifiers. There were also some ions A13+staying as the network modifiers. Because the F- entered as the network formers, the structureof network became more loose and phase separation of glass took place. Two ldnds of differentphase regions were formed in the glass, and one region contained more Ca2+ and F--, whereasanother region contained more St4+ and A13+. When the above glass with phase sepajration washeat-treated, the crystals of CaF2 firstly came out from the regions containing more Ca2+ and F--.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第4期593-598,共6页
Journal of Inorganic Materials
关键词
玻璃结构
网络
间隙
分相
network, exterior, interior, phase separation
