CRYSTAL-STRUCTURE OF BIPBSR2MNO6 BY POWDER NEUTRON-DIFFRACTION

被引：7
|
作者：
LEVY, D
FU, WT
IJDO, DJW
CATTI, M
机构：
[1] LEIDEN UNIV,LEIDEN INST CHEM,GORLAEUS LABS,2300 RA LEIDEN,NETHERLANDS
[2] UNIV MILAN,DIPARTIMENTO CHIM FIS & ELECTROCHIM,I-20133 MILAN,ITALY
来源：
SOLID STATE COMMUNICATIONS | 1994年 / 92卷 / 08期
关键词：
CHEMICAL SYNTHESIS; CRYSTAL STRUCTURE AND SYMMETRY;
D O I：
10.1016/0038-1098(94)90448-0
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The structure and the oxygen stoichiometry of the layered oxide BiPbSr2MnO6 has been examined by profile analysis from powder neutron diffraction data. The structure was refined in the space group Amaa (n degrees 66). The material has orthorhombic symmetry with lattice parameters a=5.3204(3), b=5.3796(3) and c=23.714(1)Angstrom. Its structure is analogue to that of superconducting cuprate Bi2Sr2CuO6+delta, but without modulation. An important structural feature of BiPbSr2MnO6 is that the oxygens in the (Bi,Pb)O layer are disordered over two positions along the a-axis. The calculated effective valence of manganese is 3.2. The MnO6 octahedra are elongated along the c-axis, characteristic of the Jahn-Teller distortion of octahedra with Mn3+ ions.
引用
收藏
页码：659 / 663
页数：5
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