Electrical properties of ceria co-doped with Sm3+ and Lu3+electrolyte materials
(English)Article in journal (Other academic) Submitted
Sm and Lu co-doped ceria with compositions of Ce1-x(Sm3Lu2)x/5O2-δ (SLDC, x=0.05, 0.1, 0.15, 0.2) are investigated to validate the concept of critical dopant ionic radius ( rc ), where the number-average dopant ionic radius is designed tomatch the critical dopant ionic radius ( c r ). A variety of techniques including X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to characterize the SLDC powders and the sintered pellets. Electrical properties of different specimens are investigated by using the impedance spectroscopy. The result sdemonstrated that the critical dopant ionic radius concept is not totally valid for Sm-Lu co-doping strategy, even that the co-doping with appropriate chemicalcomposition, Ce0.85(Sm3Lu2)0.03O2-δ, yields higher total conductivity than either Smor Lu-doped ceria. More co-doping strategies need to be studied to test the critical dopant ionic radius concept.
solid oxide fuel cells, critical dopant ionic radius, co-doped, ceria, conductivity
IdentifiersURN: urn:nbn:se:kth:diva-51494OAI: oai:DiVA.org:kth-51494DiVA: diva2:464282
QS 2011 QS 201203262011-12-132011-12-132012-03-26Bibliographically approved