SOUZA, J.P.FUJIMOTO, T.G.BATISTA, R.M.STEIL, M.C.MUCCILLO, R.MUCCILLO, E.N.S.2022-08-172022-08-172022SOUZA, J.P.; FUJIMOTO, T.G.; BATISTA, R.M.; STEIL, M.C.; MUCCILLO, R.; MUCCILLO, E.N.S. Phase transformation/stabilization and ionic conductivity in tantalum oxide co‑doped zirconia‑scandia solid electrolyte. <b>Ionics</b>, v. 28, n. 8, p. 3919-3926, 2022. DOI: <a href="https://dx.doi.org/10.1007/s11581-022-04604-5">10.1007/s11581-022-04604-5</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/33226.0947-7047http://repositorio.ipen.br/handle/123456789/33226The influence of small amounts of tantalum oxide as co-dopant on phase transformation and stabilization, microstructure and ionic conductivity of zirconia-10 mol% scandia is reported in this work. Cylindrical pellets were prepared by solid state synthesis with sintering at 1500 °C for 5 h. High relative density values (> 95%) were achieved. Reduction of the enthalpy for the cubic ⇌β-rhombohedral phase transformation was found for increasing amounts of the co-dopant. Full stabilization of the cubic structure at room temperature was obtained with only 0.45 mol% tantalum oxide addition. The ionic conductivity of sintered specimens was investigated as a function of the temperature and oxygen partial pressure by impedance spectroscopy. The fully stabilized co-doped system revealed a pure ionic conduction behavior up to 800 °C with wide electrolytic domain. In the 700–800 °C range, the ionic conductivity of co-doped specimens is similar to that of pure zirconia-scandia.3919-3926openAccesszirconiumceramicsphase transformationsmicrostructuresolid electrolytesionic conductivityArtigo de periódico82810.1007/s11581-022-04604-50000-0001-9219-388X0000-0002-8598-279Xhttps://orcid.org/0000-0001-9219-388Xhttps://orcid.org/0000-0002-8598-279X38.170.5