【摘要】 用固相反应合成了Ｌｎ１－ｘＳｒｘＭｎＯ３（Ｌｎ＝Ｐｒ，Ｎｄ，Ｓｍ，Ｇｄ，Ｙｂ和Ｙ，ｘ≤０．５）系钙钛矿型多元氧化物，用Ｘ光衍射分析测定了反应产物的相组成和结构类型．离子半径＞０．１Ａ的Ｐｒ，Ｎｄ，Ｓｍ，Ｇｄ等取代后的Ｌｎ１－ｒＳｒｘＭｎＯ３仍具有正交ＬａＭｎＯ３的结构，而离子半径＜０．９５Ａ的Ｙ和Ｙｂ取代后的产物，则为六方结构（Ｙｂ，Ｙ）ＭｎＯ３及第二相Ｓｒ（Ｙｂ，Ｙ）２Ｏ４还测定了产物的烧结性能和电导率．发现（Ｐｒ，Ｎｄ，Ｓｍ）１－ｘＳｒｘＭｎＯ３的电导率比Ｌａ１－ｘＳｒｘＭｎＯ３约高一个数量级以上，而且都能在ＺｒＯ２固体电解质上形成结合良好的膜材，所以有可能成为另一类性能良好的燃料电池的阴极材料．更多还原

【Abstract】 Perovskite-type polyatomic oxides with a general formula Ln1 - x Srx MnO3 (Ln= Pr , Nd, Sm , Gd, x ≤ 0. 5 )were synthesized by solid reaction at 1400℃. The phase composition and sturcture type of the reaction products were analysed by means of X-ray diffraction . Ln1-xSrxMnO3 with Ln=Pr, Nd, Sm, Gd, which have ionic radius bigger than 1.0A, still retain the orthorhomic structure of LaMnO3. However, when Ln is Yb or Y with a radius lower than 0.95A, the products are the hexagonal (Tb, Y)MnO3 with a second phase of Sr(Yb, Y)2O4, which lead to a lower electronic conductivity. (Pr, Nd, Sm)1-xSrxMnO3 has a conductivity about one order of magnitude higher than La0.7Sr0.3MnO3 and can form a firm film on YSZ ceramics.更多还原