Synthesis of Nanocrystalline Ce0.8Gd0.2O2− Electrolyte Materials for IT-SOFC
Abstract:We successfully synthesized nano-sized Ce0.8Gd0.2O2− powders by combustion method, using gelatin as fuel. The calcined powders showed high-quality characteristics, i.e., nano-scale size (14–35 nm) and narrow size distribution. The structural, morphological, and electrical characteristics of the sintered Ce0.8Gd0.2O2− were studied systematically, depending on sintering temperature. The crystal structure of the Ce0.8Gd0.2O2− belonged to the cubic fluorite structure. The gelatin-assisted combustion synthesized Ce0.8Gd0.2O2− powders allowed to sinter well at low temperature for dense and ultra-fine Ce0.8Gd0.2O2− electrolyte with good electrical conductivity. The sintering temperature of the Ce0.8Gd0.2O2 powder was ∼300°C lower than that of conventional solid-state synthesized powder. The nanopowder produced was sintered into pellets with relative densities over 99.1% of the theoretical value even at 1400 °C. The Ce0.8Gd0.2O2− sintered at 1400 °C exhibited a conductivity of 0.101 S/cm at 800 °C in air.
Document Type: Research Article
Publication date: November 1, 2010
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