Gd/Sm-Pr Co-Doped Ceria: A First Report of the Precipitation Method Eect on Flash Sintering
- Gd/Sm-Pr Co-Doped Ceria: A First Report of the Precipitation Method Eect on Flash Sintering
- 그라지아 아카르도; Luca Spiridigliozzi; Lorenzo Pinter; Mattia Biesuz; Gianfranco Dell’Agli; Vincenzo M. Sglavo
- Issue Date
- VOL 12, NO 1218-14
- 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 dierent electrical cycles (including current-ramps). Dierent 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
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