SILICA GLASS DOPED WITH ND AND AL PREPARED BY SOL-GEL METHOD - CHANGE IN THE STATE OF ALUMINUM IN THE FORMATION PROCESS

被引:42
作者
FUJIYAMA, T [1 ]
YOKOYAMA, T [1 ]
HORI, M [1 ]
SASAKI, M [1 ]
机构
[1] KYUSHU UNIV,COLL GEN EDUC,FUKUOKA 810,JAPAN
关键词
D O I
10.1016/0022-3093(91)90420-B
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
To determine the effect of Al2O3 on the homogeneous dispersion of neodymium in a silica glass doped with Al3+ and Nd3+ ions, the coordination states of Al3+ and Nd3+ ions were investigated by UV-VIS absorption spectroscopy and Al-27 NMR (solution and solid). In the formation process of a silica glass (2Nd2O3-6Al2O3-92SiO2), the states of Al3+ and Nd3+ ions varied continuously. A local structure of Nd3+ ions in the silica glass was stabilized when the dried gel was heated to 300-degrees-C. The symmetry of aluminium tetrahedra was strongly affected by a Nd3+ ion through a bond between neodymium and aluminium. Distortion of the aluminum tetrahedra became large with increase in temperature of heat treatment for the dried gel. It was concluded that the isolation of Nd3+ ions may be stabilized by distortion of the aluminium tetrahedra.
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页码:198 / 203
页数:6
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