以硬脂酸、氧化镧、硝酸镍和硝酸铁为原料,采用硬脂酸凝胶法合成了纯相 LaNi0.6 Fe0.4 O3粉体。为避免制备过程中产生杂相,实验采用了直接煅烧法,即先将炉内温度升至煅烧温度保持恒温,然后将凝胶置于炉内焙烧。在650℃下成功合成了 La-Ni0.6 Fe0.4 O3粉体。用差示扫描量热法(DSC)和热重分析(TG)对其热处理过程进行分析,并用X射线衍射分析(XRD)和扫描电镜(SEM)对其结构和形貌进行表征。结果表明,合成的 LaNi0.6 Fe0.4 O3粉体纯度高、分散性好,粒径<1μm,且工艺过程简单,具有较好应用前景。
LaNi0.6 Fe0.4 O3 cathode powders for solid oxide fuel cell was synthesized at 650℃ by stearic acid gel method using stearic acid,lanthanum oxide,nickel nitrate and ferric nitrate as raw materials.The direct calci-nation method was designed to efficiently avoid the formation of the impurities in the synthesis process.Differ-ential scanning caborimetry analysis (DSC)and thermogravimetric analysis (TG)were used to characterize the process of calcining. The powder properties were characterized by XRD and SEM. The as-prepared La-Ni0.6 Fe0.4 O3 powders showed a better degree of crystallization and a high degree of purity after calcined at 650℃for 2h.The size of particles with perovskite structure was in sub-micron and no large reunite in the powder.
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