Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10567711 | Journal of Power Sources | 2011 | 15 Pages |
Abstract
ⶠA compositional series of high purity, nanoparticulate SDC materials was successfully prepared by a low temperature, inexpensive citrate complexation method in order to perform a detailed study of the effect of chemical composition, sintering temperature and sintering time on the densification, grain structure and ionic conductivity of the resulting dense pellets. ⶠCrystallization of the SDC product occurred from the gel at a temperature below 300 °C to give foam-like, single-phase materials with high porosity and with primary crystalline particles of about 10 nm diameter. ⶠDensities of over 95% of theoretical were achieved for all three compositions after sintering at 1400 °C or higher for 4 h or longer and both density and average grain size increased with increasing sintering temperature and sintering time. Samples sintered at 1400 °C for 6 h or 1450 °C for 4 h showed excellent microstructure for all compositions. ⶠArrhenius-type plots of electrolyte conductivity showed an inflexion at around 500 °C and this was interpreted in terms of a defect association enthalpy, ÎHa, and an oxygen migration enthalpy, ÎHm. ÎHa was less sensitive to Sm content and had values of around 0.4 eV. ÎHm increased significantly with %Sm and had values of 0.4-0.7 eV. ⶠAt 600 °C, the highest total conductivity was 1.81 Ã 10â2 S cmâ1 for the 20SDC sample sintered at 1450 °C for 6 h.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Marcin R. Kosinski, Richard T. Baker,