高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (5): 753.

• 论文 •    下一篇

六方类钙钛矿体系La2Ca2MnO7-Sm2Ca2MnO7的结构变化和相关系

别利剑1,2, 李国宝1, 廖复辉1, 林建华1   

  1. 1. 北京大学化学与分子工程学院稀土材料化学与应用国家重点实验室, 北京 100871;
    2. 临沂师范学院化学系, 临沂 276005
  • 收稿日期:2002-07-24 出版日期:2003-05-24 发布日期:2003-05-24
  • 通讯作者: 林建华(1955年出生),男,博士,教授,博士生导师,主要从事无机固体化学研究.E-mail:jhlin@chem.pku.edu.cn E-mail:jhlin@chem.pku.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20131010)

Structure Variation and Phase Relationship of the Hexagonal Perovskite System La2Ca2MnO7-Sm2Ca2MnO7

BIE Li-Jian1,2, LI Guo-Bao1, LIAO Fu-Hui1, LIN Jian-Hua1   

  1. 1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
    2. Department of Chemistry, Linyi Teachers' College, Linyi 276005, China
  • Received:2002-07-24 Online:2003-05-24 Published:2003-05-24

摘要: 利用柠檬酸盐前驱物法制备了La2-xSmxCa2MnO7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≤0.8和x≥1.0)和一个两相区(O.8<x<1.0).体系的这种结构变化可以用稀土离子的半径变化说明.

关键词: 六方类钙钛矿, 夹层化合物, 锰酸盐, 固体化学

Abstract: La2-xSmxCa2MnO7samples were prepared from citric acid sol-gel precursor by using solid state reaction. The cell parameters of the sample were refined by using Rietveld method, which evidence the presence of single-phase regions(x≤0. 8 and x≥1. 0) and two-phase region 0.8<x<1. 0. The structure variation of the system can be understood by considering the ionic size of rare earth cation.

Key words: Hexagonal perovskite, Intergrowth compound, Manganate, Solid state chemistry

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