Crystal structure and properties of Bi1-xCaxFeO3 and Bi1-xCaxFeO1-xTixO3 solid solutions

被引：30
作者：
Troyanchuk, I. O. [1 ]
Karpinsky, D. V. [1 ]
Bushinskii, M. V. [1 ]
Prokhnenko, O. [2 ]
Kopcevicz, M. [3 ]
Szymczak, R. [4 ]
Pietosa, J. [4 ]
机构：
[1] Natl Acad Sci Belarus, Joint Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
[2] Hahn Maitner Inst, D-14109 Berlin, Germany
[3] Inst Elect Mat Technol, PL-01919 Warsaw, Poland
[4] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
来源：
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2008年 / 107卷 / 01期
关键词：
D O I：
10.1134/S106377610807008X
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Systems of solid solutions Bi1-xCaxFeO3 (I) and Bi1-xCaxFeO1-xTixO3 (II) have been obtained and their properties have been studied using neutronography and Mossbauer spectroscopy; magnetization and permittivity have been measured. It is shown that an increase in the concentration of calcium ions in system I for x > 0.2 changes rhombohedral distortions of a unit cell (space group R3c) to tetragonal distortions (space group I4/mcm), while rhombohedral distortions in system II for x > 0.2 are replaced by orthorhombic distortions (space group Pnma). Analysis of the crystal structure has revealed strong anisotropy in vibrations of Bi and O ions in system I compounds. Systems I and II are characterized by G-type antiferromagnetic ordering of magnetic moments. In system II, spontaneous magnetization associated with the Dzyaloshinskii-Moriya interaction has been detected. According to Mossbauer spectroscopy data, iron ions in compounds I and II are in the trivalent state and charge compensation occurs due to the formation of oxygen vacancies. The permittivity increases with the calcium concentration.
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页码：83 / 89
页数：7
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