SAXS investigation of morphology changes in lead-titanate aerogels

被引：3
|
作者：
Geis, S
Lobmann, P
Fricke, J
机构：
[1] Univ Wurzburg, Inst Phys, D-97074 Wurzburg, Germany
[2] Fraunhofer Inst Silicatforsch, D-97082 Wurzburg, Germany
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 1998年 / 225卷 / 01期
关键词：
angulosity; lead-titanate aerogel; SAXS;
D O I：
10.1016/S0022-3093(98)00121-5
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：
Highly porous lead-titanate (PT) aerogels were prepared by sol-gel-processing and drying under supercritical conditions in isopropanol. After annealing in air for one hour at seven temperatures from 110 to 600 degrees C samples were ground for SAXS-measurements. Different models were used to fit the scattering data. Nanosized structures in the PT-aerogel backbone vanish upon thermal treatment around 250 degrees C. The specific surface area decreases monotonically with annealing temperature. SAXS-data are compared to recent N-2-sorption measurements. The main finding of our investigations was that the crystallization of small amorphous spheres into big angular particles can be studied using a concept called angulosity. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：226 / 229
页数：4
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