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OALib Journal期刊
ISSN: 2333-9721
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sofcs阴极材料la06sr04co1-xfexo3-δ溶胶凝胶自燃烧法的制备
, PP. 30-34
Keywords: 溶胶凝胶自燃烧法,超细粉体,lscf,电导率
Abstract:
？以分析纯la(no3)3·6h2o、sr(no3)2、co(no3)2·6h2o和fe(no3)3·9h2o为原料，采用溶胶凝胶自燃烧法制备了不同组成的la06sr04co1-xfexo3-δ(lscf)超细粉体。采用x线衍射（xrd）和透射电子显微镜（tem）对合成超细粉体的结构和形貌进行测定和表征。结果表明：溶胶凝胶自燃烧法可一步合成粒径为30~70nm的lscf超细粉体，且随着fe3+含量的增加，衍射峰值向低角度方向略有偏移。对超细粉体的烧结性能、热膨胀性能及电性能进行测试，结果表明：该粉体在1100℃下烧结2h，其相对密度达到97％。热膨胀系数随x(fe3+含量)增加而增大，由x=01时的842×10-6k-1增大至x=05时的956×10-6k-1。直流四端子法电导测试表明：电导率随温度的升高（200~800℃）出现极大值，最大值可达950s/cm，在500~700℃范围内，电导率均在200s/cm以上，能够很好地满足中低温固体氧化物燃料电池对阴极材料的要求。
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