Abstract
La0.6Sr0.4Co0.2Fe0.8O3-Δ (LSCF) nano powders were synthesized via liquid citrate, spray drying, ethanol based sol-gel, auto combustion and EDTA/citrate complexing methods. All primary powders were calcined at 1000°C. XRD results showed that auto combustion method results in the purest powder. The results of SEM micrographs showed that this sample is nano scale and has narrow particle size distribution Effects of pressing pressure, sintering temperature and dwell time on membranes microstructure were investigated. The result showed that the most and the least effective parameters on densification and grain growth are temperature and pressing pressure. The optimum pressing pressure, sintering temperature, and dwell time were 2000 bar, 1200°C, and 8 h, which showed the highest relative density, favorable crystal growth, and nonporous crack-free structure. Effects of sintering conditions on oxygen permeation flux were studied and the results showed that oxygen permeation flux increases with average grain size.
©2012 by Walter de Gruyter Berlin Boston
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