Synthesis and Characterization of La0.8Sr0.2Cu0.95Fe0.05O2.5-δ
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：宋希文 王志峰 彭军 安胜利
文章页码：14 - 17
摘 要：La0.8Sr0.2Cu0.95Fe0.05O2.5-δ （LSCF） powder was synthesized via a Pechini-type gel route. The combustion behavior of the gel was analyzed by a differential scanning calorimetry and thermogravimetry analysis （DSC/TG） method. The DSC/TG results show that the igniting temperature of the gel is around 190 ℃. The crystal structure and chemical stability of LSCF were assessed by the X-ray diffraction （XRD） method. The LSCF powder heat treated at 900 ℃ is a single phase with orthorhombic perovskite structure, the crystal lattice parameters a, b and c are 0.548430, 1.037549 and 0.384504 nm, respectively. When it was cofired with Ce0.8Sm0.2O1.9（SDC） at 1000 ℃, there is no formation of new phase. But a second phase of La0.75Sr0.25CuSmO4 is detected at 1100 ℃. The electrical conductivity of LSCF was measured by the four-point D C method. The electrical conductivity of LSCF sintered at 1000 ℃ is higher than 450 S·cm-1, the activation energy is 0.043 eV, which is acceptable for cathode material in IT-SOFC. However, the conductivity of LSCF sintered at 1100 ℃ is less than 250 S·cm-1.
宋希文，王志峰，彭军，安胜利
摘 要：La0.8Sr0.2Cu0.95Fe0.05O2.5-δ （LSCF） powder was synthesized via a Pechini-type gel route. The combustion behavior of the gel was analyzed by a differential scanning calorimetry and thermogravimetry analysis （DSC/TG） method. The DSC/TG results show that the igniting temperature of the gel is around 190 ℃. The crystal structure and chemical stability of LSCF were assessed by the X-ray diffraction （XRD） method. The LSCF powder heat treated at 900 ℃ is a single phase with orthorhombic perovskite structure, the crystal lattice parameters a, b and c are 0.548430, 1.037549 and 0.384504 nm, respectively. When it was cofired with Ce0.8Sm0.2O1.9（SDC） at 1000 ℃, there is no formation of new phase. But a second phase of La0.75Sr0.25CuSmO4 is detected at 1100 ℃. The electrical conductivity of LSCF was measured by the four-point D C method. The electrical conductivity of LSCF sintered at 1000 ℃ is higher than 450 S·cm-1, the activation energy is 0.043 eV, which is acceptable for cathode material in IT-SOFC. However, the conductivity of LSCF sintered at 1100 ℃ is less than 250 S·cm-1.
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