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Dell’Agli, G.,Spiridigliozzi, L.,Marocco, A.,Accardo, G.,Frattini, D.,Kwon, Y.,Yoon, S.P. Elsevier 2017 Ceramics international Vol.43 No.15
<P><B>Abstract</B></P> <P>Nanocrystalline Samarium (20mol%)-doped ceria (SDC20) nanopowders were prepared using a combined co-precipitation/hydrothermal treatment synthesis route carried out at reduced temperature (120°C). The amorphous precursor experiences some microstructural transformations during the hydrothermal treatment, and after 16h a Samarium-Cerium hydroxide carbonate, characterized by a hexagonal crystalline lattice, spherical morphology and particles of about 100nm in size, with a very low degree of agglomeration, is the only present phase in contrast to the initial amorphous state. After the calcination step, the powders which preserved this morphology are still characterized by the absence of hard agglomerates. As a consequence, these powders exhibited an excellent sintering behaviour with a microstructure characterized by regular, equiaxed and micrometric grain size. In fact, at 1500°C a nearly perfect densified sample was obtained, but also at 1300°C a very good sintering behaviour was observed. Finally, the electrochemical characterization carried out by EIS measurements showed a very good electrical behaviour with high ionic conductivity, i.e. at 800°C 5.2·10<SUP>−2</SUP> Scm<SUP>−1</SUP> and 4.8·10<SUP>−2</SUP> Scm<SUP>−1</SUP> for pellets sintered at 1500°C and 1300°C respectively, making them suitable for IT-SOFCs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
L. Spiridigliozzi,G. Dell’Agli,A. Marocco,G. Accardo,M. Pansini,S.P. Yoon,H.C. Ham,D. Frattini 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Nanometric powders of doped and co-doped ceria based ceramics with spherical-like morphology and characterized by very low degree of agglomeration, were prepared by using a simple and cheap synthesis route, easily scalable on industrial level, based on an optimized co-precipitation process with ammonium carbonate as precipitating agent. The as-synthesized powders are completely converted to ceria with fluorite structure. The original morphology and the nanometric features are also preserved. Nearly perfect dense products were obtained after sintering at 1300 °C for 3 h, as by SEM and density measurements. Electrochemical measurements proved that they are all suitable as electrolytes for IT-SOFC.