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The Effect Of Co And Zn Addition On Densification And Electrical Properties Of Ceria-based Nanopowders

By Villas-Boas, Lucia Adriana, Pedro Augusto, Richard, Marcelo and Dulcina Maria

Abstract

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)In this work, cobalt and zinc-doped Ce0.8Gd0.2O1.9 samples were prepared starting from a commercial nanopowder and compared to the undoped material. The powder samples were pressed and afterwards sintered by a two-step procedure, before characterization by X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Impedance Spectroscopy (IS) in air. Cobalt or zinc additions are effective as sintering aid, allowing peak sintering temperatures around 1000 degrees C to reach densifications above of 93% of theoretical density, showing no evidence for the presence of secondary phases. The total conductivity at 800 degrees C of pressed Zn-doped samples (6.7x10(-2) S/cm) and Co-doped samples (7.5x10(-2) S/cm) is similar for undoped samples (7.2x10(-2) S/cm) showing that Zn and Co has a positive effect on densification without compromising the electrical conductivity.19510571063CAPESCNPqCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Topics: Gadolinium-doped Ceria, Cobalt Addition, Zinc Addition, Xps, Sofc
Publisher: São Carlos
Year: 2017
DOI identifier: 10.1590/1980-5373-MR-2015-0643
OAI identifier: oai:repositorio.unicamp.br:REPOSIP/327776
Journal:

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