Yを置換した(La,Y,Sr)MnO_3のSOFCカソード材料への適用

概要

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A material consisting of (La_<1-x>Y_x) _<0.7>Sr_<0.3>MnO_3 was synthesized and evaluated to enhance the thermal expansion compatibility with an electrolyte material of Solid Oxide Fuel Cells (SOFC) compared with the standard system La_<0.7>Sr_<0.3>MnO_3. In addition, its crystal structure, chemical stability, electrical conductivity and electrode performance were examined. For the substitution range x=0.0-0.2 in the (La_<1-x>Y_x)_<0.7>Sr_<0.3>MnO_3 system, a single perovskite phase was observed. The mixture of (La_<1-x>Y_x)_<0.7>Sr_<0.3>MnO_3 (x=0.0-0.6) and YSZ, which was fired at 1400℃ after mixing, did not contain the reaction products, such as La_2Zr_2O_7, Y_4Zr_3O_<12>, and SrZrO_3. The average thermal expansion coefficients between 50℃ and 1000℃ at x = 0.0 and x = 0.2 were 12.2 × 10^<-6> K^<-1> and 11.5 × 10^<-6> K^<-1>, respectively. The electrical conductivity of the phase
社団法人日本セラミックス協会の論文
2002-07-01