Spiridigliozzi, Luca Pinter, Lorenzo Biesuz, Mattia Dell'Agli, Gianfranco Accardo, Grazia Sglavo, Vincenzo M. 2024-01-19T20:04:55Z 2024-01-19T20:04:55Z 2022-01-10 2019-04-02 1996-1944 https://pubs.kist.re.kr/handle/201004/120112 In this work, ceria-based ceramics with the composition Gd0.14Pr0.06Ce0.8O2- and Sm0.14Pr0.06Ce0.8O2-, were synthesized by a simple co-precipitation process using either ammonium carbonate or ammonia solution as a precipitating agent. After the calcination, all of the produced samples were constituted by fluorite-structured ceria only, thus showing that both dopant and co-dopant cations were dissolved in the fluorite lattice. The ceria-based nanopowders were uniaxially compacted and consequently flash-sintered using different electrical cycles (including current-ramps). Different results were obtained as a function of both the adopted precipitating agent and the applied electrical cycle. In particular, highly densified products were obtained using current-ramps instead of traditional flash treatments (with the power source switching from voltage to current control at the flash event). Moreover, the powders that were synthesized using ammonia solution exhibited a low tendency to hotspot formation, whereas the materials obtained using carbonates as the precipitating agent were highly inhomogeneous. This points out for the first time the unexpected relevance of the precipitating agent (and of the powder shape/degree of agglomeration) for the flash sintering behavior. English MDPI ELECTRICAL-PROPERTIES SOLID ELECTROLYTES AMMONIUM CARBONATE THERMAL RUNAWAY COPRECIPITATION DENSIFICATION TEMPERATURE NANOPOWDERS BEHAVIOR AIDS Gd/Sm-Pr Co-Doped Ceria: A First Report of the Precipitation Method Effect on Flash Sintering Article 10.3390/ma12081218 1 MATERIALS, v.12, no.8 MATERIALS 12 8 scie scopus 000467767400024 2-s2.0-85065637247 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Physics, Applied Physics, Condensed Matter Chemistry Materials Science Metallurgy & Metallurgical Engineering Physics Article ELECTRICAL-PROPERTIES SOLID ELECTROLYTES AMMONIUM CARBONATE THERMAL RUNAWAY COPRECIPITATION DENSIFICATION TEMPERATURE NANOPOWDERS BEHAVIOR AIDS co-doped ceria flash sintering precipitation