Preparation of gas-tight strontium-doped lanthanum cobaltate by an aqueous sol-gel process

被引：16
|
作者：
Chen, CH [1 ]
Kruidhof, H [1 ]
Bouwmeester, HJM [1 ]
Burggraaf, AJ [1 ]
机构：
[1] UNIV TWENTE,FAC CHEM TECHNOL,LAB INORGAN CHEM MAT SCI & CATALYSIS,7500 AE ENSCHEDE,NETHERLANDS
来源：
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 1996年 / 39卷 / 02期
关键词：
lanthanum cobaltate; sol-gel; dense membrane;
D O I：
10.1016/0921-5107(96)01582-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Gas-tight dense membranes of highly Sr-doped LaCoO3 (such as the composition La0.3Sr0.7CoO3 chosen in this study) are difficult to prepare using usual synthesis processes. This report presents an aqueous sol-gel route using metal acetates as precursors to achieve this goal. Hydrogen peroxide and ammonia are added to the acetates precursor solution to obtain stable sol and xerogel, as well as a homogeneous powder after heat treatment. Thermal analysis and XRD show the presence of SrCO3 and La2O3 when the heat treatment temperature of the xerogel is lower than 950 degrees C. Single phase of cubic perovskite La0.3Sr0.7CoO3 can be obtained after treatment at above 1000 degrees C. Sintering the cold pressed green compact at above 1100 degrees C may result in gas-tight samples. It is found that the sintering temperature has a minor influence on the oxygen permeability of a gas-tight membrane.
引用
收藏
页码：129 / 132
页数：4
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