Crystal structure and magnetic properties of Sr4Mn2NiO9

被引:26
作者
El Abed, A
Gaudin, E
Lemaux, S
Darriet, J
机构
[1] CNRS, UPR 9048, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
[2] Univ Mohamed Ler, Fac Sci, Lab Phys Solide, Oujda, Morocco
关键词
perovskite; synthesis; crystal structure; XANES; magnetic properties;
D O I
10.1016/S1293-2558(01)01213-4
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The crystal structure of Sr4Mn2NiO9 has been refined on single crystal. This phase belongs to the series A(1+x)(A'B-x(1-x))O-3 (x = 1/3) related to the 2H-hexagonal perovskite. The structure contains transition metals in chains of oxide polyhedra (trigonal x prisms and octahedra); neighboring chains are separated from each other by the Sr atoms. The sequence of the face sharing polyhedra along the chains is two octahedra + one trigonal prism. Mn occupies the octahedra and Ni is disordered in the trigonal prism with approximate to 80% in the pseudo square faces of the prism and approximate to 20% at the centre. This result has been confirmed by XANES experiments at Mn K and Ni K edges, respectively. Sr4Mn2NiO9 is antiferromagnetic with a Neel temperature at T = 3 K. The Curie constant measured at high temperature is in good agreement with approximate to 80% of the Ni2+ ions in the spin state configuration S = 0. (C) 2001 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
引用
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页码:887 / 897
页数:11
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