(La_(1-x)Pr_x)_(2/3)Sr_(1/3)CoO_3的成相过程与电导性能研究  

Study on Synthetical Process and Electrical Properties of (La_(1-x)Pr_x)_(2/3)Sr_(1/3)CoO_3

作　　者：姜涛[1] 丁铁柱[1] 潮洛蒙[1] 范文亮[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021

出　　处：《稀土》2009年第3期22-26,共5页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(10464001)

摘　　要：采用固相反应法合成了(La1-xPrx)2/3Sr1/3CoO3(x=0.2,0.4,0.6,0.8)双稀土氧化物系列粉体,研究了(La0.6Pr0.4)2/3Sr1/3CoO3的成相过程和电导性能。结果表明,在实验过程中首先出现了La2O(CO3)和La2SrOx相,而La2SrOx相在270℃～910℃的较大范围内一直存在,再经过两次吸热到910℃时出现了(La0.6Pr0.4)2/3Sr1/3CoO3晶相,当温度达到1000℃时,(La0.6Pr0.4)2/3Sr1/3CoO3成为主晶相,在1250℃下烧结2h后,样品已成单一钙钛矿结构(La0.6Pr0.4)2/3Sr1/3CoO3相。(La1-xPrx)2/3Sr1/3CoO3(x=0.2,0.4,0.6,0.8)双稀土氧化物的电导率在700℃附近时出现最大值,其中(La0.8Pr0.2)2/3Sr1/3CoO3的电导率在中温范围内最大,适合作为中温固体氧化物燃料电池阴极材料。（La1-xPrx）2/3Sr1/3CoO3 （x = 0.2,0.4,0.6,0.8） were fabricated by solid state - reaction method. Synthetical process and electrical properties of （La0.6Pr0.4）2/3Sr1/3CoO3 were studied. The results indicated that La2O（CO3） and La2SrOx phases firstly appeared in the sintering process. La2SrOx phase presented between 270℃and 910℃. Two absorbing entothennal reactions indicated （La0.6Pr0.4）2/3Sr1/3CoO3 phase presented at 910℃ and became the major phase at 1000℃ .The sample became a perovskite phase at 1250℃. The maximmn conductivity of the （La1-xPrx）2/3Sr1/3CoO3（x = 0.2,0.4,0.6,0.8） materials was shown at 700℃. （La0.8 Pr0.2）2/3Sr1/3CoO3 shows the highest electrical conductivity among the four materials in the intermediate- temperature, and can be considered to be a suitable cathode materials for intermediate- temperature solid oxide fule cells.

关 键 词：(La1-xPrx)2/3Sr1/3CoO3 成相过程 电导率 

分 类 号：TQ174.13[化学工程—陶瓷工业] O614.33[化学工程—硅酸盐工业]