화학공학소재연구정보센터
Solid State Ionics, Vol.288, 76-81, 2016
The effect of microwave sintering on stability and oxygen mobility of praseodymium nickelates-cobaltites and their nanocomposites
Co-doped praseodymium nickelates PrNi1-xCoxO3-delta and their composites with yttrium doped ceria Ce0.9Y0.1O2-delta are known to be promising materials for intermediate temperature solid oxide fuel cells and membranes for oxygen separation. Powdered samples were obtained via Pechini route and ultrasonic dispersion followed by mechanical activation. Pellets were sintered at 870-1100 degrees C by using microwave radiation. In comparison with conventionally sintered materials, the phase transition leading to Ruddlesden-Popper phase formation was shifted down for about 50 degrees C-100 degrees C The effect of sintering by microwave radiation consisted of dramatically increased sample density, improved phase purity and enhanced oxygen mobility. When undesirable phase transitions at elevated sintering temperatures hinder gas-tight layers preparation, the microwave sintering technique can be used without any deterioration of transport properties of materials in comparison with conventional calcination. (C) 2016 Elsevier B.V. All rights reserved.