Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7717659 | International Journal of Hydrogen Energy | 2014 | 9 Pages |
Abstract
The effect of co-doping of Sr and Al or Fe on the microstructure, sinterability and oxide-ion conductivity of lanthanum silicate oxyapatites is investigated in detail at 300-800 °C by the electrochemical impedance spectroscopy. The oxide-ion conductivity is 1.46 Ã 10â2 S cmâ1 for La9.5Sr0.5Si5.5Fe0.5O26.5 (LSSFO) and 1.34 Ã 10â2 S cmâ1 at 800 °C for La9.5Sr0.5Si5.5Al0.5O26.5 (LSSAO), respectively, which is one order of magnitude higher than 6.16 Ã 10â3 S cmâ1 measured on La9.67Si6O26.5 (LSO) oxyapatite under the identical test conditions. The grain bulk and grain boundary resistances of co-doped oxyapatite are significantly smaller than that of LSO oxyapatite, and decrease significantly with the increase of the sintering temperature. LSSFO and LSSAO also show significantly higher density as compared to that of LSO. The results indicate that co-doping of Sr and Al or Fe significantly improves the densification, sinterability and oxide-ion conductivity of lanthanum silicate oxyapatites.
Related Topics
Physical Sciences and Engineering
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Authors
Xiao Guo Cao, San Ping Jiang,