| GNP법에 의해 합성한 (La1-xSrx)Mn1+yO3−δ 분말의 출발물질에 따른 특성 |
| 이미재, 김세기, 지미정, 최병현, 박상선1, 이경희2 |
요업(세라믹)기술원 전자소재팀
1비츠로셀(주)
2명지대학교 무기재료공학과 |
| Effect of Starting Materials on the Characteristics of (La1-xSrx)Mn1+yO3−δ Powder Synthesized by GNP |
| Mi-Jai Lee, Sei-Ki Kim, Mi-Jung Jee, Byung-Hyun Choi, Sang-Sun Park1, Kyung-Hee Lee2 |
Electronic Materials Laboratory, Korea Institute of Ceramic Engineering Technology
1R&D Center, VITZROCELL Co.
2Inorganic Material Engineering, Myongji University |
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| ABSTRACT |
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We synthesized $(La_{1-x}Sr_x)MnO_3$ as a cathode for SOFC by glycine nitrate process (GNP) and knew the different properties of $(La_{1-x}Sr_x)MnO_3$ 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 $LaMnO_3$ increased as Sr content added up and a peak of $Sr_2MnO_4;and;La_2O_3$ 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 $700^{circ}C$. On the other side, when we used oxide solution as a starting material, we found main crystal phase of $LaMnO_3$ to increase as Sr content added up and a peak of $La_2O_3$ as a secondary phase. Similary, we added Mn excess to control a crystal phase in this case. We knew $(La,Sr)MnO_3$ powder to sinter well and the electrical conductivity of the sintered body at $1200^{circ}C$ for 4 h was 152.7 S/cm at $700^{circ}C$. The sintered $(La,Sr)MnO_3$ powder at $1000^{circ}C$ 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 $450^{circ}C$ which is lower than used a oxide solution as a starting material. As a result, when $(La,Sr)MnO_3$ 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 $(La,Sr)MnO_3$ powder by using different starting materials like nitrate solution and oxide solution which influence a sintering density and crystal phase. |
| Key words:
$(La_{1-x}Sr_x)Mn_{1+y}O_{3-\delta}$, SOFC, GNP, Cathode, Deoxidization |
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