| Texto completo | |
| Autor(es): |
Souza, J. P.
;
Fujimoto, T. G.
;
Batista, R. M.
;
Steil, M. C.
;
Muccillo, R.
;
Muccillo, E. N. S.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | IONICS; v. 28, n. 8, p. 8-pg., 2022-05-13. |
| Resumo | |
The 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 degrees C for 5 h. High relative density values (> 95%) were achieved. Reduction of the enthalpy for the cubic beta-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 degrees C with wide electrolytic domain. In the 700-800 degrees C range, the ionic conductivity of co-doped specimens is similar to that of pure zirconia-scandia. (AU) | |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |