Effects of Ca-source on the sintering and electrical properties of La _0.7Ca_0.3Cr_0.9Co_0.1O _3-δ for solid oxide fuel cell interconnects

Effects on sintering and electrical properties of La_0.7Ca _0.3Cr_0.9Co_0.1O_3-δ system, a interconnect material for cylindrical and flat tubular solid oxide fuel cells (SOFC), have been investigated by Ca-source when using CaCO₃ and CaF₂.. When using CaCO₃ and CaF2 was mixing as Ca-source, single phased perovskite solid solution was observed for each sample. The sintering temperature was decreased by CaF₃ contents was increased. When using 0.1 mole CaF₃ was densely sintered at 1400°C and relative density was 93.8%. Also, electrical conductivity in oxidation and reducing atmosphere was 47, 4.3 S/cm, respectively, due to F^-ion enhance the electrical conductivity in reducing atmosphere.