Effect of iron doping nano-GDC synthesized via low temperature heterogeneous precipitation

Reference Presenter Authors
06-232 Marina Machado Moraes, L.P.(Instituto de Pesquisas Energéticas e Nucleares); Machado, M.(Instituto de Pesquisas Energéticas e Nucleares); Nunes, L.(Instituto de Pesquisas Energéticas e Nucleares); Fonseca, F.C.(IPEN); Gadolinium-doped cerium oxide exhibits beneficial properties for application as an electrolyte in electrochemical devices. However, it requires a high sintering temperature to obtain a fully dense body. In this study the effect of adding iron oxide to gadolinium-doped cerium (GDC) oxide to improve its sinterability and electrochemical performance was accessed. Doped GDC with different Fe molar concentrations (1, 3, 5 mol%) was successfully synthesized by a one-step aqueous precipitation method. Adding Fe 2 O 3 as a sintering aid increases the GDC densification and reduces its usual sintering temperature by ~300 °C. The microstructural and electrical properties of sintered pellets evidenced that using iron oxide as a sintering aid is a promising strategy to decrease sintering temperature of GDC.
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