Preparation and Characterization of Silicate Gel Glasses Containing Cr2O3

被引：0
作者：
Ferreira Da Silva, M. G. [1 ]
Fernandez Navarro, J. M. [2 ]
机构：
[1] Univ Aveiro, Dept Engn Ceram & Vidro, Aveiro 3800, Spain
[2] Inst Ceram & Vidrio, Madrid, Spain
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 1994年 / 2卷 / 1-3期
关键词：
color; silica glass; sol-gel;
D O I：
暂无
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of thermal treatment on the structural incorporation of Cr2O3 in xCr(2)O(3)center dot(100-x) SiO2 and 5R(n)O center dot xCr(2)O(3)center dot(95-x)SiO2 (where x = 0.01 - 1 mol.% and R = Li, Na and Ca) gel glasses was studied by optical absorption spectrophotometry, DTA-TG, XRD and electron microscopy. Samples heat treated at 60 degrees C have green color due to the presence of Cr3+ in octahedral coordination. The optical transmission, and color (yellow, orange or ambar), of the samples heat treated between 200 and 700 degrees C prove that Cr3+ (octahedrally coordinated) and Cr6+ (tetrahedrally coordinated) are both present. Segregation of Cr2O3 take place at temperatures above 800 degrees C. In reducing conditions the gel glasses were green due to the presence of a high content of Cr3+ ions. Samples containing Li or Na show crystalline phases at temperatures below 850 degrees C.
引用
收藏
页码：895 / 901
页数：7
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