Sintering property of cation substituted LaCrO3 system could be improved by simultaneous substitution of Ca and Sr for La site. It was revealed that grain size and their distribution increased by Ca and/or Sr substitution, resulting in 80% and 87% sintering density of La0.75Ca0.05Sr0.20CrO3 and La0.70Ca0.05Sr0.25CrO3, respectively. Electrical conductivity and activation energy of La0.70Ca0.05Sr0.25CrO3 are nearly equal to those of La0.7Ca0.35CrO3, which has been already employed as an interconnector of SOFC or as a material for high temperature heater. We regard that La0.70Ca0.05Sr0.25CrO3 with high electrical conductivity has promising property for various electrical applications since it is free from structural phase transition involving discrete volume variation.
Keywords: La1-x-yCaxSryCrO3, sintering, microstructure, phase transition, electrical conductivity
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