钙钛矿氧化物(La_(1-x)Pr_x)_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ)氧化学扩散性能的研究  

Investigation on Oxygen Chemical Diffusion Properties of Perovskite Oxides (La_(1-x)Pr_x)_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ)

作　　者：潮洛蒙[1] 丁铁柱[1] 王晓波[1] 范文亮[1] 张磊[1] 闫祯[1] 

机构地区：[1]内蒙古大学,内蒙古呼和浩特010021

出　　处：《稀有金属材料与工程》2011年第S2期15-20,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(10464001)

摘　　要：采用固相反应法合成了(La1-xPrx)0.6Sr0.4Co0.8Fe0.2O3-δ(x=0.2,0.4,0.6,0.8)钙钛矿氧化物系样品,用电导驰豫法研究了(La1-xPrx)0.6Sr0.4Co0.8Fe0.2O3-δ系样品的氧化学扩散性能。结果表明:(La1-xPrx)0.6Sr0.4Co0.8Fe0.2O3-δ系样品的电导率随氧分压的增大而增大;氧化学扩散系数Dchem随温度的降低、Pr含量增加而线性下降;在高氧分压下,Dchem随末态氧分压的变化不大;(La0.8Pr0.2)0.6Sr0.4Co0.8Fe0.2O3-δ样品的氧扩散系数最大,在600℃时达到9.41×10-5cm2·s-1,是比较理想的中温固体燃料电池阴极材料。Perovskite oxides (La1-x Prx)0.6Sr0.4Co0.8Fe0.2O3-δ(x=0.2, 0.4, 0.6, 0.8) samples were obtained by a solid state-reaction method. The oxygen chemical diffusion properties of (La1-xPrx )0.6Sr0.4Co0.8Fe0.2O3-δ were determined by electrical conductivity relaxation technique. The results show that the conductivity of (La1-x Prx )0.6Sr0.4Co0.8Fe0.2O3-δ increases with increasing of oxygen partial pressure. The (La1-xPrx)0.6Sr0.4Co0.8Fe0.2O3-δ samples have higher oxygen chemical diffusion coefficients, which decrease linearly with the decreasing of temperature and increasing of Pr content. The oxygen chemical diffusion coefficients D chem remains fairly constant at high Po2 . The oxygen chemical diffusion coefficient is highest at x=0.2, 9.41×10-5 cm 2 ·s-1 at 700 ℃, and the material is comparatively potential cathodes material for intermediate temperature solid oxide fuel cells

关 键 词：(La_1-xPr_x)_0.6Sr_0.4Co_0.8Fe_0.2O_3-δ 氧化学扩散 钙钛矿氧化物 电导弛豫 

分 类 号：TM911.4[电气工程—电力电子与电力传动]