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采用柠檬酸盐法合成了La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ(LSCCF,x=0.05,0.1,0.15和0.2)粉料。TG-DSC分析表明,凝胶在320℃~558℃分解为相应的氧化物。XRD测试表明:产物前躯体在800℃下热处理3h就可制备出具有畸变钙钛矿结构的LSCCF粉料。电导率测试表明,随着烧结温度的升高和Sr2+含量的增加,样品电导率变大,其导电活化能变小。在600℃~800℃范围内,LSCCF样品的电导率为102S/cm~103S/cm,能够满足中温固体氧化物燃料电池阴极材料的要求。LSCCF粉料与Ce0.8Sm0.2O2电解质在800℃下烧结10h后没有新相生成,表明LSCCF粉料与Ce0.8Sm0.2O2电解质具有良好的化学相容性。
La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ (LSCCF, x = 0.05, 0.1, 0.15 and 0.2) powders were synthesized by citrate method. TG-DSC analysis showed that the gel decomposed to the corresponding oxide at 320 ℃ ~ 558 ℃. XRD results showed that LSCCF powder with deformed perovskite structure could be prepared by heat treatment at 800 ℃ for 3 h. Conductivity tests show that with the increase of sintering temperature and the content of Sr2 +, the conductivity of the sample becomes larger and its conductivity activation energy becomes smaller. The conductivity of LSCCF samples ranged from 102S / cm to 103S / cm in the range of 600 ℃ to 800 ℃, which can meet the requirements of cathode materials for medium temperature solid oxide fuel cells. LSCCF powder and Ce0.8Sm0.2O2 electrolyte sintered at 800 ℃ for 10h after the formation of new phase, indicating that LSCCF powder and Ce0.8Sm0.2O2 electrolyte has good chemical compatibility.