【摘要】 采用固相反应法合成了(La1-xPrx)2/3Sr1/3Co0.8Ni0.2O3(LPSCN,x=0.2、0.4、0.6、0.8)钙钛矿型氧化物系列样品,采用电导弛豫法研究了LPSCN样品的氧化学扩散系数。结果表明,LPSCN样品具有较高的氧化学扩散系数,且随着镨含量的减少、温度的升高而增大;LPSCN样品的电导率与氧分压呈σ∝Pon2关系,且电导率随镨含量的减少、温度的降低而增大。样品LPSCN-82在800℃下的氧化学扩散系数Dchem值为1.18×10-4cm2/s;样品LPSCN-82在500℃下氧分压为1.0×105Pa时电导率有最大值为974.74S/cm,是比较理想的固体氧化物燃料电池的阴极材料。更多还原

【Abstract】 The specimen of(La1-xPrx)2/3Sr1/3Co0.8Ni0.2O3(LPSCN,x=0.2,0.4,0.6,0.8)were obtained by solid state-reaction method.Electrical conductivity relaxation method was used to determine the oxygen chemical diffusion coefficients Dchem.The results indicate that the LPSCN samples have higher oxygen chemical diffusion coefficients,which increase gradually with the decreasing of content Pr and the rising of temperature.The relation of conductivity and oxygen partial pressure is σ∝ POn2.The conductivity increases with the reducing of content Pr and the decreasing of temperature.The oxygen chemical diffusion coefficient Dchem of LPSCN-82 is 1.18×10-4cm2/s at 800℃.The max conductivity of the specimen of LPSCN-82 is 974.74S/cm at 500℃,1.0×105Pa oxygen partial pressure.更多还原