Atomic displacements in BiFeO3 as a function of temperature:: neutron diffraction study

被引：163

作者：

Palewicz, A.

Przenioslo, R.

Sosnowska, I.

Hewat, A. W.

机构：

[1] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS | 2007年 / 63卷

关键词：

MODULATED MAGNETIC-STRUCTURE; MULTIFERROIC BIFEO3; CRYSTAL;

D O I：

10.1107/S0108768107023956

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The parameters of the crystal structure of BiFeO3, described within the space group R3c, have been determined by high-resolution neutron powder diffraction for temperatures from 293 to 923 K. It was found that there is a local minimum for the rhombohedral angle alpha(rh), near the Neel temperature T-N similar or equal to 640 K, a gradual rotation of the FeO6 octahedra and an increase of the Fe - O - Fe angle. The displacement of the Bi3+ ions from the FeO6 octahedra which influence the electric polarization decreases with temperature. One of the Bi - Fe distances also has a local maximum near T-N. The atomic vibrations of Bi3+ and O2- ions show a significant anisotropy.

引用

页码：537 / 544

页数：8

共 43 条

[1] Systematic prediction of new ferroelectrics in space group R3.: I [J].