Off-stoichiometry effects on BiFeO3 thin films

被引：81
|
作者：
Lahmar, A. [1 ,2 ]
Zhao, K. [1 ]
Habouti, S. [1 ]
Dietze, M. [1 ]
Solterbeck, C. -H. [1 ]
Es-Souni, M. [1 ]
机构：
[1] Univ Appl Sci, Inst Mat & Surface Technol, Kiel, Germany
[2] Univ La Rochelle, LEACIM, F-17042 La Rochelle 01, France
来源：
SOLID STATE IONICS | 2011年 / 202卷 / 01期
关键词：
Bismuth ferrite; Phase diagram; Defect structure; Ferroelectric properties; Magnetic properties; FERROELECTRIC PROPERTIES; NEUTRON-DIFFRACTION; SYSTEM;
D O I：
10.1016/j.ssi.2011.03.017
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effects of Bi and Fe-excess on the structure, ferroelectric, leakage current and magnetic properties of BiFeO3 (BFO) thin films are reported. BFO with 5% excess exhibits no change in the structure with an improvement in leakage current properties in comparison to stoichiometric BFO. Raman spectroscopy of 10% Bi excess suggests a structural change from monoclinic to rhombohedral accompanied with an improvement of resistivity and ferroelectric polarization switching. A higher Fe-excess leads to the formation of pyrochlore Bi2Fe4O9 and gamma-Fe2O3 that cause an increase in conductivity at the macroscopic scale. The results are discussed in terms of Fe and Bi-excess effects on the defect structure of BFO. (C) 2011 Elsevier B.V. All rights reserved.
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页码：1 / 5
页数：5
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