Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

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

GNP법에 의해 합성한 (La1-xSrx)Mn1+yO3−δ 분말의 출발물질에 따른 특성

  • Lee, Mi-Jai (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering Technology) ;
  • Kim, Sei-Ki (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering Technology) ;
  • Jee, Mi-Jung (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering Technology) ;
  • Choi, Byung-Hyun (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering Technology) ;
  • Park, Sang-Sun (R&D Center, VITZROCELL Co.) ;
  • Lee, Kyung-Hee (Inorganic Material Engineering, Myongji University)
  • 이미재 (요업(세라믹)기술원 전자소재팀) ;
  • 김세기 (요업(세라믹)기술원 전자소재팀) ;
  • 지미정 (요업(세라믹)기술원 전자소재팀) ;
  • 최병현 (요업(세라믹)기술원 전자소재팀) ;
  • 박상선 (비츠로셀(주)) ;
  • 이경희 (명지대학교 무기재료공학과)
  • Published : 2007.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Keywords

References

  1. H. B. Wang, J. F. Gao, D. K. Peng, and G. Y. Meng, 'Plasma Deposition of $La_{0.8}Sr_{0.2}MnO_3$ Thin Films on Yttria-Stabilized Zirconia from Aerosol Precursor,' Mater. Chem. and Phys., 72 [3] 297-300 (2001) https://doi.org/10.1016/S0254-0584(01)00331-5
  2. E. Bucher, W. Sitte, I. Rom, I. Papst, W. Grogger, and F. Hofer, 'Microstructure and Ionic Conductivity of Strontium- Substituted Lanthanum Cobaltites,' Solid State Ionics, 417 417-421 (2002) https://doi.org/10.1016/S0167-2738(02)00354-5
  3. V. V. Kharton, A. V. Kovalevsky, A. P. Viskup, F. M. Figueiredo, A. A. Yaremchenko, E. N. Naumovich, and F. M. B. Marques, 'Oxygen Permeability and Faradaic Efficiency of $Ce_{0.8}Gd_{0.2}O_{2-\delta}-La_{0.7}Sr_{0.3}MnO_{3-\delta}$ Composites,' J. Eur. Ceram. Soc., 21 1763-1767 (2001) https://doi.org/10.1016/S0955-2219(01)00167-4
  4. H. Taguchi, S.-I. Matsu-ura, M. Nagao, T. Choso, and K. Tabata, 'Synthesis of $LaMnO_{3+\delta}$ by Firing Gels Using Citric Acid,' J. Solid State Chem., 129 [1] 60-5 (1997) https://doi.org/10.1006/jssc.1996.7229
  5. Q. Zhang and F. Saito, 'Mechanochemical Synthesis of $LaMnO_3$ from $La_2O_3$ and $Mn_2O_3$ Powders,' J. Alloys and Comp., 297 99-103 (2000) https://doi.org/10.1016/S0925-8388(99)00606-4
  6. M. Kakihana, M. Arima, M. Yoshimura, N. Ikeda, and Y. Sugitani, 'Synthesis of High Surface Area $LaMnO_{3+\delta}$ by a Polymerizable Complex Method,' J. Alloys and Comp., 283 102-105 (1999) https://doi.org/10.1016/S0925-8388(98)00865-2
  7. W.-S. Shin, I.-S. Park, S.-J. Kim, and S. Park, 'Studies on the Fabrication and Properties of $La_{0.7}Sr_{0.3}MnO_3$ Cathode Contact Prepared by Glycine-Nitrate Process and Solid State Reaction Method for the High Efficient Solid Oxide Fuel Cells Applications,' Bull. Kor. Ins. Electrical & Electronic Mat. Eng., 10 [2] 141 (1997)
  8. R. Peng, C. Xia, Q. Fu, G. Meng, and D. Peng, 'Sintering and Electrical Properties of $(CeO_2)_{0.8}(Sm_2O_3)_{0.1}$ Powders Prepared by Glycine-Nitrate Process,' Mater. Lett., 56 [6] 1043-1047 (2002) https://doi.org/10.1016/S0167-577X(02)00673-0
  9. S. P. Jiang, 'Issues on Development of (La,Sr)$MnO_3$ Cathode for Solid Oxide Fuel Cells,' J. Power Source, 124 [2] 390-402 (2003) https://doi.org/10.1016/S0378-7753(03)00814-0
  10. S. T. Aruna, M. Muthuraman, and K. C. Patil, 'Combustion Synthesis and Properties of Strontium Substituted Lanthanum Manganites $La_{1-x}Sr_xMnO_3$ (0 https://doi.org/10.1039/a703901h
  11. Y. Ji, J. Liu, T. He, L. Cong, J. Wang, and W. Su, 'Single Intermedium-Temperature SOFC Prepared by Glycine-Nitrate Process,' J. Alloys and Comp., 353 257-262 (2003) https://doi.org/10.1016/S0925-8388(02)01198-2
  12. S. J. Kim, C. H. Jung, K. H. Kim, Y. S. Kim, and I. H. Kuk, 'Preparation of NiO/YSZ Ultra-Fine Powder Composites Using Self-Sustaining Combustion Process(in Korean),' J. Kor. Ceram. Soc., 33 [4] 411-417 (1996)
  13. H. Y. Lee, 'Study on the Electrochemical and Interfacial Properties of $La_{1-x}Sr_xMnO_3$ and $Y_{0.8}Ca_{0.2}Fe_xCo_{1-x}O_3$ Cathode for SOFC,' in Ph.D. Thesis, Seoul University, Seoul, 1997
  14. R. J. Bell, G. J. Millar, and J. Drennan, 'Influence of Synthesis Route on the Catalytic Properties of $La_{1-x}Sr_xMnO_3$,' Solid State Ionics, 131 211-220 (2000) https://doi.org/10.1016/S0167-2738(00)00668-8