Sintering and electrical conductivity of gadolinia-doped ceria

Author(s)

Batista, R. M. ^[1] ; Ferreira, A. M. D. C. ^[2] ; Muccillo, E. N. S. ^{[1, 3]}

Affiliation

^[1] Energy & Nucl Res Inst IPEN, POB 11049, BR-05422970 Sao Paulo, SP - Brazil

^[2] Univ S Paulo, Inst Chem, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[3] Ctr Mat Sci & Technol, Ave Prof Lineu Prestes, 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: IONICS; v. 22, n. 7, p. 1159-1166, JUL 2016.
• Web of Science Citations: 1

Abstract

Bulk specimens of Ce0.9Gd0.1O2-delta prepared with powders within a range of specific surface area were sintered in oxidizing, inert, and reducing atmospheres. The aim of this work is to investigate the effects of the sintering atmosphere on the microstructure and grain and grain boundary conductivities of the solid electrolyte. The lattice parameter determined by Rietveld refinement is 0.5420(1) nm, and the microstrain was found negligible in the powder materials. Specimens sintered in the Ar/4 % H-2 mixture display larger average grain sizes independent on the particle size of the starting powders. The grain and grain boundary conductivities of specimens sintered under reducing atmosphere are remarkably lower than those sintered under oxidizing and inert atmospheres. The activation energy (similar to 0.90 eV) for total electrical conductivity remains unchanged with both the initial particle size and the sintering atmosphere. (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