Influence of stabilizer (Li2O) on the sintering density and ionic conductivity of K-β/β''-aluminas
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Sintering of K-β-aluminas in the system K2O-Al2O3-Li2O was carried out at atmospheric pressure. The influence of Li2O as a stabilizer on densification and ionic conductivity, depending on its content, has been investigated. In order to lower the sintering temperature, the calcined powders were ultra-fine milled by an attrition mill. Relations between sintering density, microstructure and ionic conductivity were studied. The samples were prepared in the molar ratio range [K2O]:[Al2O3]=1:5- 1:11, and the Li2O content was varied from 0 to 1.6 wt%. The maximum ionic conductivity has been observed with the sample having a molar ratio of [K2O]:[Al2O3]=1:5 and containing 0.8 wt% of stabilizer. This sample showed 97% density and its ionic conductivity was measured to be 1.1×10−1 and 5×10−3 S/cm at 800 oC and 300 oC, respectively.
Abstract
Sintering of K-β-aluminas in the system K2O-Al2O3-Li2O was carried out at atmospheric pressure. The influence of Li2O as a stabilizer on densification and ionic conductivity, depending on its content, has been investigated. In order to lower the sintering temperature, the calcined powders were ultra-fine milled by an attrition mill. Relations between sintering density, microstructure and ionic conductivity were studied. The samples were prepared in the molar ratio range [K2O]:[Al2O3]=1:5- 1:11, and the Li2O content was varied from 0 to 1.6 wt%. The maximum ionic conductivity has been observed with the sample having a molar ratio of [K2O]:[Al2O3]=1:5 and containing 0.8 wt% of stabilizer. This sample showed 97% density and its ionic conductivity was measured to be 1.1×10−1 and 5×10−3 S/cm at 800 oC and 300 oC, respectively.