Improved ionic conductivity of zirconia-scandia with niobia addition
Full text
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| Author(s): |
Grosso, Robson L.
;
Reis, S. L.
;
Muccillo, E. N. S.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | CERAMICS INTERNATIONAL; v. 43, n. 14, p. 10934-10938, OCT 1 2017. |
| Web of Science Citations: | 2 |
| Abstract | |
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) | |
| FAPESP's process: | 12/03319-5 - Preparation and characterization of scandia-stabilized zirconia containing additives |
| Grantee: | Robson Lopes Grosso |
| Support type: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support type: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |