用改进的柠檬酸法合成了具有钙钛矿结构的LSGM(La0.9Sr0.1Ga0.85Mg0.15O3-δ)和Co掺杂的LSGMC8.5(La0.9Sr0.1(Ga0.9Co0.1)0.85Mg0.15O3-δ). 并从XRD、DTA-TG曲线、交流阻抗谱、电导率、密度和化学稳定性等方面比较了LSGM 和LSGMC8.5的性能. 从而探讨了Co掺杂对于LSGM性能的影响. 结果表明相对于LSGM, Co的掺杂使立方钙钛矿结构的形成温度由1400℃降低到1300℃左右, 离子电导率由3.85×10-2上升到5.38×10-2S/cm, 密度由理论密度的95%上升到99%. 因此Co的掺杂使LSGM的各方面性能都有了一定的提高, LSGMC8.5比LSGM更适合做中温SOFC的电解质材料.
The perovskite-type LSGM(La0.9Sr0.1Ga0.85Mg0.15O2.875) and Co-doped
LSGMC8.5 (La0.9Sr0.1(Ga0.9Co0.1)Mg0.15O3-δ) were synthesized by the advanced Pechini method. Their properties were compared by the analysis of XRD, DTA-TG, impedance spectra, conductivity and density. It showed that Co doping decreased the forming temperature of cubic perovskite structure from 1400℃ to 1300℃, and increased the fractional density from 95% to 99%. The conductivity of the LSGMC8.5 sintered at 1400℃ for 6h is 5.38×10-2S/cm. So the Co-doped LSGMC8.5 is more suitable for IT-SOFC.
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