Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Variations in the Properties of LSGM System Electrolyte with Sr and Mg Addition and Sintering Conditions

Sr과 Mg 첨가량 및 소결조건에 따른 LSGM계 전해질의 특성 변화

  • Lee, Mi-Jai (Department of Advanced Functional Materials Research, Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Sang-Sun (Department of Advanced Functional Materials Research, Korea Institute of Ceramic Engineering and Technology) ;
  • Choi, Byung-Hyun (Department of Advanced Functional Materials Research, Korea Institute of Ceramic Engineering and Technology)
  • 이미재 (요업기술원 신기능재료연구부) ;
  • 박상선 (요업기술원 신기능재료연구부) ;
  • 최병현 (요업기술원 신기능재료연구부)
  • Published : 2002.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

The variations of the properties of Sr and Mg added $LaGaO_3$ system electrolyte with the amount of the additive and the sintering condition were studied. Main phase was (La$_{1-x}Sr_x)(Ga_{1-y}Mg_y)O_{3-\delta}$ phase for each compositions and the single phases $(La_{0.85}Sr_{0.15})(Ga_{0.85}Mg_{0.15})O_{3-\delta},(La_{0.85}Sr_{0.15})(Ga_{0.8}Mg_{0.2})O_{3-\delta}$ and $(La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O{3-\delta}$ were obtained with the decrease in the sintering temperature and Mg addition. Thermal expansion coefficient of the $(La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O_{3-\delta}$ decreased with the increase in the sintering temperature. Electric conductivity of electrolyte sintered at $1500^{circ}C$ for 1h was 0.14 S/cm at $800^{circ}C$ with 1 mA.

고체산화물 연료전지의 전해질로서 $LaGaO_3$계를 선정하여 La 대신 Sr을, Ga 대신에 Mg를 치환하여 첨가할 때 첨가량 및 소결 조건에 따라 전해질을 제조하고, 그 특성을 조사하였다. Sr과 Mg가 0.15와 0.20 mole 첨가되었을 때 Sr과 Mg가 La와Ga 자리에 동시 고용되어 (La$_{1-x}Sr_x)(Ga_{1-y}Mg_y)O_{3-\delta}$ 단일상이 나타났고, 일부 조성에서는 $LaSrGa_3O_7$ 상과 $LaSrGaO_4$ 상이 2차상으로 나타났다. $LaSrGa_3O_7$ 상은 Sr과 Mg 첨가에 의한 상이며, $LaSrGaO_4$ 상은 액상형성에 의한 것으로 나타났으며, 또한 $LaSrGaO_4$ 상은 소결온도와 Mg 첨가량이 감소함에 따라 얻어졌다. $(La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O_{3-\delta}$ 상의 경우 소결온도를 증가함에 따라 열팽창계수는 감소하였으며, $1500^{circ}C$에서 1시간 소결한 소결체의 전기전도도는 $800^{circ}C$, 1mA에서 0.14S/cm를 나타내었다.

Keywords

References

  1. N. Q. Minh, 'Ceramic Fuel Cells,' J. Am. Ceram. Soc., 76 [3] 563-88 (1993) https://doi.org/10.1111/j.1151-2916.1993.tb03645.x
  2. N. Q. Minh, 'High-temperature Fuel Cells. Part II: The Solid Oxide Cell,' Chemtech., 21 120-26 (1991)
  3. S. M. Choi, K. T. Lee, S. Kim, M. C. Chun and H. L. Lee, 'Oxgen lon Conductivity and Cell Performance of $La_0.9Ba_0.1Ga1-xMg_xO_3-\delta$ Electrolyte,' Solid State lonics, 131221-28 (2000) https://doi.org/10.1016/S0167-2738(00)00673-1
  4. J. D. Kim, G. D. Kim, J. W. Moon, C. E. Kim, H. W. Lee and D. A. Lee, 'Interface Reaction Between LSMC and YSZ and Impedance Properties(in Kor.),' J. Kor. Ceram. Soc., 35 [9] 899-904 (1998)
  5. C. H. Lee and G. M. Choi, 'Electrical Conductivities of $[(ZrO_2)_{1-x}(CeO_2)_x]_{0.92}(Y_2O_3)_{0.08}$ Solid Solution(m Kor.),' J. Kor. Ceram. Soc., 35 [12] 1323-28 (1998)
  6. T. Ishihara, H. Matsuda and Y. Takita, 'Doped LaGa$O_3$ Per-ovskite Oxide as a New Oxide lonic Conductor,' J. Am. Chem. Soc., 116 [9] 3801-03 (1994) https://doi.org/10.1021/ja00088a016
  7. T. Ishihara, M. Higuchi, H. Furutani, T. Fukushima, H. Nishiguchi and Y. Takita, 'Potentiometric Oxygen Sensor Poerable in Low Temperature by Applying LaGa$O_3$-based Oxide for Electrolyte,' J. EIectrochem. Soc., 444 [5] L122-L125 (1997)
  8. T. Ishihara, H. Matsuda and Y. Takita, 'Effects of Rare Earth Cations Doped for La Site on the Oxide lonic Con-ductivity of LaGa$O_3$-based Perovskite Type Oxide,' Solid State lonics, 79 147-51 (1995) https://doi.org/10.1016/0167-2738(95)00054-A
  9. T. Ishihara, M. Honda, T. Shibayama, H. Minaim, H. Nish-iguchi and Y. Takita, 'Intermidiate Temperature Solid Oxide Fuel Cells Using a New LaGa$O_3$ Based Oxide lon Con-ductor,' J. Electrochem. Soc., 145 [9] 3177-83 (1998) https://doi.org/10.1149/1.1838783
  10. J. Drennan, V, Zelizko, D. Hay, F. T. Ciacchi, S. Rajendran and Sukhvinder P. S. Badwal, 'Characterisation, Conduc-tivity and Mechanical Properties of the Oxygen-ion Con-ductor $LA_{0.9}Sr_{0.1}Ga_{0.8}Mg_{0.2}O_{3-x}$,' J. Muter. Chem., 1 [1] 79-83 (1997)
  11. A. E. Stephens, H. J. Mackey and J. R. Sybert, 'Effect of Contact Placement and Sample Shape in the Measurement of Electrical Resistivity,' J. AppI. Phys., 42 [7] 2592-97(1971) https://doi.org/10.1063/1.1660594
  12. K. Huang, R. S. Tichy and J. B. Goodenough, 'Superior Perovskite Oxide-ion Conductor Strontium-and Magne-sium-doped LaGa$O_3$ I, Phase Relationships and Electrical Properties,' J. Am. Ceram. Soc., 81 [10] 2565-75 (1998) https://doi.org/10.1111/j.1151-2916.1998.tb02662.x
  13. K. Huang, R. S. Tichy and J. B. Goodenough, 'Superior Perovstdte Oxide-ion Conductor Strontium-and Magne-sium-doped LaGa$O_3$ II, ac Impedance Spectroscopy,' J. Am. Ceram. Soc., 81 [10] 2576-80 (1998) https://doi.org/10.1111/j.1151-2916.1998.tb02663.x
  14. K. S. Yoo, D. Y. Byun and A. J. Jacobson, 'Electrical Con-ductivity of $LA_{2-x}Sr_xMo_{2-y}Cr_yO_{9-\delta}$ lonic Conductors(in Kor.),' J. Kor. Ceram. Soc., 38 [8] 693-97 (2001)