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J. Korean Ceram. Soc. > Volume 44(12); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(12): 696.
doi: https://doi.org/10.4191/kcers.2007.44.1.696
연료전지용 LSGM 페로브스카이트계 전해질의 합성 및 특성 연구
성영훈, 조승환, 조승환, 김도경
한국과학기술원 신소재공학과
Synthesis and Characterization of LSGM Solid Electrolyte for Solid Oxide Fuel Cell
Young-Hoon Seong, Seung-Hwan Jo, P. Muralidharan, Do-Kyung Kim
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST)
The family of (Sr,Mg)-doped $LaGaO_3$ compounds, which exhibit high ionic conductivity at $600-800^{circ}C$ over a wide range of oxygen partial pressure, appears to be promising as the electrolyte for intermediate temperature solid oxide fuel cells. Conventional synthesis routes of (Sr,Mg)-doped $LaGaO_3$ compounds based on solid state reaction have some problems such as the formation of impurity phases, long sintering time and Ga loss during high temperature sintering. Phase stability problem especially, the formation of additional phases at the grain boundary is detrimental to the electrical properties of the electrolyte. From this point of view, we focused to synthesize single phase (Sr,Mg)-doped $LaGaO_3$ electrolyte at the stage of powder synthesis and to apply relatively low heat-treatment temperature using novel synthesis route based on combustion method. The synthesized powder and sintered bulk electrolytes were characterized by XRD, TG-DTA, FT-IR and SEM. AC impedance spectroscopy was used to characterize the electrical transport properties of the electrolyte with the consideration of the contribution of the bulk lattice and grain boundary to the total conductivity. Finally, relationship between synthesis condition and electrical properties of the (Sr, Mg)-doped $LaGaO_3$ electrolytes was discussed with the consideration of phase analysis results.
Key words: LSGM, Electrolyte, Synthesis, Sintering, AC impedance, Ionic conductivity
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