Role of oxygen vacancies in deciding the high temperature magnetic properties of Ba and Sm substituted BiFeO3 ceramics

被引：14

作者：

Zhang, N. ^{[1
,2
]}

Yang, Y. W. ^{[1
]}

Su, J. ^{[1
]}

Guo, D. Z. ^{[1
]}

Liu, X. N. ^{[1
]}

Ma, N. ^{[1
]}

Liu, Z. M. ^{[1
]}

Zhao, M. ^{[1
]}

Li, X. T. ^{[1
]}

Guo, Y. Y. ^{[3
]}

Chang, F. G. ^{[1
]}

Liu, J. -M. ^{[2
]}

机构：

[1] Henan Normal Univ, Dept Phys, Henan Key Lab Photovolta Mat, Xinxiang 453007, Peoples R China

[2] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ Posts & Telecommun, Coll Elect Sci & Engn, Nanjing 210003, Jiangsu, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 677卷

关键词：

BiFeO3; Oxygen vacancies; Magnetic property; FERROELECTRIC PROPERTIES; MULTIFERROIC PROPERTIES; RARE-EARTH; POLARIZATION; SIZE;

D O I：

10.1016/j.jallcom.2016.03.262

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：

A series of Bi(1-x)A(x)FeO(3) (A = Ba2+, Sm3+) compounds have been synthesized in order to reveal the influence of oxygen vacancies on the magnetic behavior of BiFeO3. While the rhombohedral structure is retained for all compositions (0 <= x <= 0.2), the Ba2+ and Sm3+ substitution induces different structural disorder, leading to an enhancement in magnetization. Temperature dependence of magnetization between 300 K and 900 K indicates that the increased oxygen vacancy due to Ba2+ substitution gradually turns the original antiferromagnetic behavior of BiFeO3 into a ferromagnetic one. In contrast, the antiferromagnetic nature of BiFeO3 is maintained in the whole Sm3+ substitution range, in which the concentration of oxygen vacancies is preserved. This result reveals unambiguously that the oxygen vacancies also play a crucial role in deciding the magnetic behavior of BiFeO3. The intrinsic magnetic property of BiFeO3 is originated from not only the Fe3+/Fe3+ but also the unbalanced Fe3+/Fe2+ antiferromagnetic superexchange interactions. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：252 / 257

页数：6

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