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.

引用

页码：675 / 681

页数：7

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