Effect of Starting Materials on the Characteristics of (La1-xSrx) Mn1+yO3-delta Powder Synthesized by GNP

We synthesized (Lal-x,Sr-x)MnO3 as a cathode for SOFC by glycine nitrate process (GNP) and knew the different properties of (La1-xSrx)MnO3 by using nitrate solution and oxide solution as a starting material. In case of using nitrate solution as a starting material, main crystal phase peak of LaMnO3 increased as Sr content added up and a peak of Sr2MnO4 and La2O3 was showed as a secondary phase. We added Mn excess to control a crystal phase. In this case, the electrical conductivity had a high value 210.3 S/cm at 700 degrees C. On the other side, when we used oxide solution as a starting material, we found main crystal phase of LaMnO3 to increase as Sr content added up and a peak of La2O3 as a secondary phase. Similary, we added Mn excess to control a crystal phase in this case. We knew (La,Sr)MnO3 powder to sinter well and the electrical conductivity of the sintered body at 1200 degrees C for 4 h was 152.7 S/cm at 700 degrees C. The sintered (La,Sr)MnO3 powder at 1000 degrees C for 4 h got the deoxidization peak, depending on the temperature and in case of using nitrate solution as a starting material, the deoxidization peak was showed at 450 degrees C which is lower than used a oxide solution as a starting material. As a result, when (La,Sr)MnO3 powder was synthesized to add Mn excess and to use nitrate solution as a starting material, we found it to have the higher deoxidization property and considered it as a cathode for SOFC properly. And we found it to have different electrical conductivity the synthesized (La,Sr)MnO3 powder by using different starting materials like nitrate solution and oxide solution which influence a sintering density and crystal phase.