Thermal stability of A-site ordered PrBaMn2O6 manganites

被引：110
|
作者：
Trukhanov, SV
Trukhanov, AV
Szymczak, H
Szymczak, R
Baran, M
机构：
[1] NASB, Inst Phys Solids & Semicond, Minsk 220072, BELARUS
[2] Vitebsk State Univ, Dept Chem, Vitebsk 210036, BELARUS
[3] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2006年 / 67卷 / 04期
关键词：
magnetic materials; chemical synthesis; magnetic properties;
D O I：
10.1016/j.jpcs.2005.09.099
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The crystal structure and electromagnetic properties as well as thermal stability of the A-site ordered PrBaMn2O6 manganites have been investigated. These samples have been prepared by using 'two-steps' synthesis mode. They have tetragonal structure with no tilt of MnO6 octahedra and show ferromagnetic metal to paramagnetic semiconductor transition. The most significant structural feature of the A-site ordered manganites is that the MnO2 sublattice is sandwiched by two types of rock-salt layers PrO and BaO. The different degree of Pr and Ba ions in the A-sublattice is revealed. The A-site ordered PrBaMn2O6 sample with maximum degree of the A-site order demonstrates ferromagnetic metallic to paramagnetic insulating transition with the Curie point similar to 320 K. The A-site disordered Pr0.50Ba0.50MnO3 sample is ferromagnetic metal below T-C approximate to 140 K. The cation order in these compounds is stable in air up to 1300 degrees C. For the partly A-site ordered samples the magnetic and electronic phase separation is observed. The magnetotransport properties of the A-site ordered manganites treated under different conditions are discussed in terms of the superexchange interactions and A-site order degree. (c) 2005 Elsevier Ltd. All rights reserved.
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收藏
页码：675 / 681
页数：7
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