Ca, Sr二重置換によるLaCrO_3系セラミックスの焼結特性の向上(セラミックレター)

概要

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Sintering property of cation substituted LaCrO_3 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 La_<0.75>Ca_<0.05>Sr_<0.20>CrO_3 and La_<0.70>Ca_<0.05>Sr_<0.25>CrO_3, respectively. Electrical conductivity and activation energy of La_<0.70>Ca_<0.05>Sr_<0.25>CrO_3 are nearly equal to those of La_<0.7>Ca_<0.35> CrO_3, which has already been employed as an interconnector of SOFC or as a material for a high temperature heater. We regard that La_<0.70>Ca_<0.05>Sr_<0.25>CrO_3 with high electrical conductivity has promising properties for various electrical applications since it is free from structural phase transition involving discrete volume variation.
社団法人日本セラミックス協会の論文
2007-01-01