Effect of composition on the structural development and electrical conductivity of NiO-GDC composites obtained by one-step synthesis
authors Grilo, JPF; Moura, CG; Macedo, DA; Rajesh, S; Figueiredo, FML; Marques, FMB; Nascimento, RM
nationality International
journal CERAMICS INTERNATIONAL
author keywords One-step synthesis; Composites; Microstructure; Electrical conductivity
keywords OXIDE FUEL-CELLS; ANODE MATERIALS; NANOCOMPOSITE POWDERS; PARTICLE-SIZE; CERIA; TEMPERATURE; CERMETS; MICROSTRUCTURES; SINTERABILITY; PERFORMANCE
abstract NiO-C0.9Gd0.1O1.95 (NiO-GDC) composites obtained using a chemical route (one-step synthesis) were characterized by thermal analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance spectroscopy (between 300 and 650 degrees C in air). Rietveld refinement of XRD data indicated that synthesized powders are ultrafine and the crystallite size of the GDC phase decreases with increasing NiO content. The relative density of sintered samples is influenced by the NiO content, but easily brought to values above 95% after sintering at 1450-1500 degrees C. NiO-GDC composites exhibited homogeneous phase distribution and grain size often lower than 1 gm. With 30-40 wt% NiO this phase dominates the overall electrical conductivity of NiOGDC. The combination of grain size, conductivity and microstructural characteristics shows the efficacy of the adopted processing route to obtain high quality Ni-GDC cermet precursors.
publisher ELSEVIER SCI LTD
issn 0272-8842
isbn 1873-3956
year published 2017
volume 43
issue 12
beginning page 8905
ending page 8911
digital object identifier (doi) 10.1016/j.ceramint.2017.04.027
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000402584900051
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