六方类钙钛矿体系La_(2-x)Nd_xCa_2MnO_7的结构和相关系  

Structure Variation in the Hexagonal Perovskite System La_(2-x)NdxCa_2MnO_7

作　　者：别利剑[1,2] 李国宝[1] 廖复辉[1] 林建华[1] 

机构地区：[1]北京大学稀土材料化学与应用国家重点实验室,化学与分子工程学院 [2]临沂师范学院化学系,临沂276005

出　　处：《无机化学学报》2003年第1期59-63,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20131010);国家重点实验室基金资助。

摘　　要：利用柠檬酸盐前驱物法制备了La2-xNdxCa2MnO7系列样品,并利用Rietveld方法对结构进行了精修。结果表明:体系中存在两个单相区(x≤1.0,x≥1.5)和一个两相区(1.0<x<1.5)。体系这种结构变化可以用稀土离子半径变化说明。La2-xNdxCa2MnO7 samples were prepared from citric acid sol-gel precursor using solid state reaction. The cell parameters of these samples were refined using Rietveld method, which evidence the presence of single-phase regions ( x less than or equal to 1.0 and x greater than or equal to 1.5) and two-phase region 1.0 < x < 1.5. The structure variation of this system can be understood by considering the ionic size of rare earth cation.

关 键 词：La2-xNdxCa2MnO7 结构 相关系 六方类钙钛矿 夹层化合物 锰酸盐 固体化学 

分 类 号：O614.231[理学—无机化学] O614.411[理学—化学]