Glycine nitrate process로 합성된 La0.8Sr0.2Ga0.8Mg0.1Co0.1O3 − δ 전해질의 제조 및 특성평가
Preparation and characterization of La0.8Sr0.2Ga0.8Mg0.1Co0.1O3 − δ electrolyte using glycine-nitrate process
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초록
이차상의 편석, 분말의 조성 및 합성방법은 La0.8Sr0.2Ga0.8Mg0.1Co0.1O3 − δ(LSGMC) 물질의 전도도에 영향을 미친다. 조성이 균일하고 순도가 높은 분말을 얻기 위해 GNP(Glycine nitrate process)를 이용하여 고체산화물 연료전지의 전해질재료인 La0.8Sr0.2Ga0.8Mg0.1Co0.1O3 − δ를 합성하였다. 자발연소반응 시, 글리신의 양에 따른 물질의 특성을 확인하기 위하여, 글리신/양이온 비를 0.5, 1, 1.5, 2, 2.5로 변화시켜 분말을 합성하였다. 합성된 분말의 단상의 perovskite상 동정 및 소결체의 미세구조 변화를 XRD와 SEM을 이용하여 분석하였다. 조성비가 1.5인 경우, 상대적으로 치밀하며, 800oC에서 0.131 Scm−1의우수한 전기전도특성을 나타냈다. 또한, 25~800oC 사이의 온도에서 열팽창거동이 선형을 나타내었다.
Abstract
Conductivity of LSGMC materials were affected by secondary phase segregation, composition and synthetic route. La0.8Sr0.2Ga0.8Mg0.1Co0.1O3 − δ (LSGMC) powders were prepared using the glycine nitrate process to produce high surface area and compositionally homogeneous powders. The powders were synthesized with different 0.5, 1, 1.5, 2, 2.5 of glycine/cation molar ratios. A single perovskite phase from the synthesized powders was characterized with X-ray diffraction patterns. The obtained sintered pellets showed the dense grain microstructure. In case of 1.5 molar ratio, its density was higher than the others. The electrical conductivity measured at 800oC was observed to be 0.131 Scm−1. In addition, the linear thermal expansion behavior was indicated between 25oC and 800oC.
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