Improved ionic conductivity of zirconia-scandia with niobia addition

Autor(es)

Grosso, Robson L. ; Reis, S. L. ; Muccillo, E. N. S.

• 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