Synthesis, structure and magnetic properties of the new oxygen-deficient perovskite Na3MnV2O7.5

被引：4
|
作者：
Ben Yahia, Hamdi [1 ]
Gaudin, Etienne [1 ]
Boulahya, Khalid [2 ]
Darriet, Jacques [1 ]
机构：
[1] Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France
[2] Univ Complutense, Fac Quim, Dept Quim Inorgan, E-28040 Madrid, Spain
来源：
SOLID STATE SCIENCES | 2011年 / 13卷 / 06期
关键词：
Crystal structure; Magnetic measurements; Perovskite; Vanadates; HRTEM; CRYSTAL-STRUCTURE; POWDER DIFFRACTION;
D O I：
10.1016/j.solidstatesciences.2011.03.012
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The new ternary vanadate Na3MnV2O7.5 has been synthesized by solid state reaction route. Its crystal structure was determined from both powder X-ray diffraction data and high-resolution transmission electron microscopy (HRTEM) analysis. Na3MnV2O7.5 (P2/c, a = 7.4004(4) angstrom, b = 5.6065(3) angstrom, c = 17.0876(11) angstrom, beta = 90.0114(2)degrees, and Z = 4) crystallizes with a new type of oxygen-deficient perovskite ABO(3-delta) (delta = 1/2) with the sodium atoms occupying the A site and the vanadium and manganese atoms perfectly ordered in the B site. In Na3MnV2O7.5 the manganese and the vanadium atoms are octahedral and tetrahedral coordinated, respectively. The MnO6 and VO4 polyhedra share edges and form a perovskite 3D-framework with high disorder of the oxygen atoms. HRTEM confirmed this structural model. Na3MnV2O7.5 was characterized by magnetic susceptibility and specific heat measurements. It is anti-ferromagnetic with no magnetic ordering down to 2 K. (C) 2011 Elsevier Masson SAS. All rights reserved.
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收藏
页码：1235 / 1241
页数：7
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