Improved ionic conductivity of zirconia-scandia with niobia addition

Author(s)

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

• 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: 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
• 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