Mn substitution-induced revival of the ferroelectric antiferromagnetic phase in Bi1-x Ca x FeO3-x/2 multiferroics

被引：15
|
作者：
Khomchenko, V. A. [1 ]
Pereira, L. C. J. [2 ]
Paixao, J. A. [1 ]
机构：
[1] Univ Coimbra, Dept Phys, CEMDRX, P-3004516 Coimbra, Portugal
[2] Univ Tecn Lisboa, Inst Super Tecn, Unidade Ciencias Quim & Radiofarmaceut, CTN,CFMCUL, P-2686953 Sacavem, Portugal
来源：
JOURNAL OF MATERIALS SCIENCE | 2015年 / 50卷 / 04期
关键词：
BIFEO3; CRYSTAL;
D O I：
10.1007/s10853-014-8735-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Room-temperature X-ray diffraction, piezoresponse force microscopy, and SQUID magnetometry measurements of the Bi0.9Ca0.1Fe1-y Mn (y) O-3 (0 a parts per thousand currency sign y a parts per thousand currency sign 0.5) ferromanganites have been carried out to illustrate the effect of B-site substitution on the crystal structure and multiferroic properties of the Ca-doped compound representing an intermediate ferroelectric and weak ferromagnetic phase of the Bi1-x Ca (x) FeO3-x/2 perovskites. The Mn doping has been shown to restore multiferroic behavior specific to pure BiFeO3. Indeed, the 0.1 a parts per thousand currency sign y a parts per thousand currency sign 0.4 samples have been found to possess a single-phase rhombohedral structure compatible with the ferroelectric polarization and antiferromagnetism. Further increase of the Mn concentration stabilizes an orthorhombic structure typical of the high-pressure antiferroelectric phase of the BiFe1-y Mn (y) O-3 perovskites. These results, particularly important from the viewpoint of understanding the origin of weak ferromagnetism in the Bi1-x Ca (x) FeO3-x/2 system, are discussed using a model accounting for the doping-related defect formation.
引用
收藏
页码：1740 / 1745
页数：6
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