Infrared spectroscopic study of sol-gel derived mixed-metal oxides

被引:94
作者
Parler, CM [1 ]
Ritter, JA [1 ]
Amiridis, MD [1 ]
机构
[1] Univ S Carolina, Swearingen Engn Ctr, Dept Chem Engn, Columbia, SC 29208 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0022-3093(00)00401-4
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
Binary, mixed-metal oxides of silicon-aluminum, silicon-cobalt, silicon-copper, silicon-iron, and silicon-nickel were produced via a sol-gel method and characterized with in situ Fourier transform infrared (FTIR) spectroscopy over the temperature range from 30 degreesC to 350 degreesC. Characteristic Si-O-Si IR stretches, observed at 1086 and 798 cm(-1), shifted to lower frequencies as the second metal oxide was introduced to the system, suggesting a weakening of the Si-O-Si network. In addition, new peaks observed in the 600-700 cm-l range were assigned to silicon-oxygen-metal vibrations providing further evidence that the second metal was chemically incorporated into the gel network. Heating these mixed-metal oxides to 350 degreesC only dehydroxylated the surface, with no other structural changes observed. This result indicated that the mixed-metal oxide structure. including silicon-oxygen-metal bonds, was formed during the synthesis and drying stages at relatively low temperatures (i.e., 90-110 degreesC). (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:119 / 125
页数:7
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