钙钛矿型复合氧化物La_(0.8)Sr_(0.2)Mn_(1-y)Co_yO_(3-δ)的合成与性能研究

Synthesis and Properties of Perovskite-Mixed Oxides La_(0.8)Sr_(0.2)Mn_(1-y)Co_yO_(3-δ)

以开发固体氧化物燃料电池(SOFC)新型阴极材料为目的,采用高温固相反应法合成了一系列钙钛矿型复合氧化物La0.8Sr0.2Mn1-yCoyO3-δ(LSMC,y分别取0.3,0.5和0.7),并对Mn位掺杂不同量过渡族元素Co后样品的高温电导率和热膨胀系数进行了研究,发现随着Co含量的增加,材料的电导率和热膨胀系数均增大,其中La0.8Sr0.2Mn0.3Co0.7O3-δ的电导率最高,700℃时,达270.89 S·cm-1。

In order to develop new cathode materials for solid oxide fuel cells, a series of complex oxide materials, La0.8Sr0.2Mn1-yCoyO3-δ（y takes values as 0.3, 0.5, 0.7 respectively）, with perovskite structure prepared by solid reaction synthesis. High temperature electrical conductivity and thermal expansion coefficients of these materials with varied Co content of Mn were studied. The results indicate that electrical conductivity and thermal expansion coefficients increase with the increase of Co content, among which La0.8Sr0.2Mn0.3Co0.7O3. 8 ranks the highest, reaching 270.89 S ·cm^-1at 700℃.