| Texto completo | |
| Autor(es): |
Grosso, Robson L.
;
Reis, S. L.
;
Muccillo, E. N. S.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 43, n. 14, p. 10934-10938, OCT 1 2017. |
| Citações Web of Science: | 2 |
| Resumo | |
The ionic conductivity and the crystalline structure of ZrO2-10 mol% Sc2O3- x mol% Nb2O5 solid electrolytes were investigated for x=0.25, 0.5 and 1. Dense specimens with relative densities higher than 95% were prepared by solid state reaction and sintered at 1500 degrees C for 5 h. Full stabilization of the cubic structure at room temperature was obtained for compounds with x=0.5 and 1, whereas the cubic and rhombohedric structures coexist for x=0.25. The highest ionic conductivity in codoped system was found for specimen containing 0.5 mol % niobium pentoxide, with the same order of magnitude as that of the parent solid electrolyte (zirconia-10 mol % scandia) in the high temperature range (above 600 degrees C). Preliminary investigation on phase stability shows that the isothermal conductivity of the new solid electrolyte remained constant up to 100 h at 600 degrees C. Niobium pentoxide addition was found to improve the overall ionic conductivity of zirconia-scandia solid electrolyte. (AU) | |
| Processo FAPESP: | 12/03319-5 - Preparação e caracterização da zircônia-escândia contendo aditivos |
| Beneficiário: | Robson Lopes Grosso |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| 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 |