Transmission electron microscopy study of Ruddlesden-Popper Can+1MnnO3n+1 N = 2 and 3 compounds

被引:24
作者
Bendersky, LA
Greenblatt, M
Chen, RJ
机构
[1] NIST, Div Met, Gaithersburg, MD 20899 USA
[2] Rutgers State Univ, Dept Chem, Piscataway, NJ 08854 USA
关键词
Ca3Mn2O7; Ca4Mn3O10; manganates; TEM; crystallography; phase transition;
D O I
10.1016/S0022-4596(03)00283-4
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Two Ruddlesden-Popper compounds Can+1MnnO3n (+ 1) with n = 2 and 3 synthesized by a citrate gel technique have been studied by TEM. The structure of Ca4Mn3O10 is consistent with the previously determined structure having the space group Pbca and a(-) a(-) c(+)/a(-) a(-) c(+) tilt system. The presence of defects suggests the possible high-temperature phase transition from untilted I4/mmm to Pbca. The structure of Ca3Mn2O7 was found to be different from the previously suggested I4/mmm symmetry. Ca3Mn2O7 forms with an orthorhombic structure with either Cmcm or Cmc2(1) space group. A structural model for Cmc2(1) based on the tilting of almost-rigid octahedra with a(+) c(-) c(-)/a(+) c(-) c(-) tilt system is proposed. The lamellar defects were shown to be twin variants of the Cmc2(1) structure with the (001)(t) interfaces, which suggests the possible tilting phase transition from the ideal I4/mmm to Cmc2(1) following the maximal group-subgroup. symmetry tree: I4/mmm-->Fmmm-->Bbmm(Cmem)-->Bb2(1)m(Cmc2(1)). (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:418 / 423
页数:6
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