La和Nb共掺提高BiFeO3的磁学性能

doi:10.11896/j.issn.1005-023X.2018.02.003

《材料导报》期刊社

2018, Vol. 32

Issue (2): 176-179 https://doi.org/10.11896/j.issn.1005-023X.2018.02.003

物理材料研究｜材料

La和Nb共掺提高BiFeO₃的磁学性能

邓施列,冼慧敏,陈熹,唐玲云,张弜,毛忠泉

华南理工大学物理与光电学院,广州 510640

Enhanced Magnetic Properties of Bismuth Ferrite by La and Nb Co-doping

Shilie DENG,Huimin XIAN,Xi CHEN,Lingyun TANG,Jiang ZHANG,Zhongquan MAO

Department of Physics, South China University of Technology, Guangzhou 510640

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摘要

采用溶胶-凝胶法成功制备了Bi_1-_xLa_xFe_0.99Nb_0.01O₃(x≤0.25)纳米颗粒样品,并研究了La和Nb共掺对BiFeO₃样品的晶体结构、晶粒尺寸和磁学性质的影响。根据X射线衍射及Rietveld精修结果可知,所有样品都保持R3c空间结构,且Fe-O-Fe键角随着La掺杂量的增加而减小。XPS测试结果表明,La和少量Nb共掺不会引起样品中Fe ³⁺和Fe ²⁺含量的明显变化。磁性测量发现剩余磁化强度强烈依赖于La掺杂量x。La掺杂影响着反向旋转的FeO₆八面体结构变化,而Nb离子掺杂会导致样品晶粒细化。共掺BiFeO₃的磁性增强是两种影响机制协同作用的结果。

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关键词: 铁酸铋掺杂磁学性能晶格畸变

Abstract:

In the present work, a series of Bi_1-_xLa_xFe_0.99Nb_0.01O₃ (x≤0.25) nanopowders were prepared by sol-gel method, in order to investigate the crystalline structure, grain size and magnetic properties of La and Nb co-doped BiFeO₃ nanopowders. All samples are consistent of an R3c rhombohedral structure with decreasing Fe-O-Fe bond angles as the La concentration increases, according to XRD and Rietveld refinement. The XPS data demonstrate that La and Nb co-doping do not change the ratio of Fe ³⁺ to Fe ²⁺ in doped BFO system. The remnant magnetization was found to depend markedly on La doping amount (x). It is shown that the La-doping dominates the anti-rotation of the FeO₆ octahedral, while the low doping of Nb results in the refinement of the grains. Both mechanisms would give rise to the magnetization enhancement in bismuth ferrite.

Key words: bismuth ferrite doping magnetic properties lattice distortion

出版日期: 2018-01-25 发布日期: 2018-01-25

ZTFLH:

O76

基金资助: 国家自然科学基金(11304098;11504113)

引用本文:

邓施列,冼慧敏,陈熹,唐玲云,张弜,毛忠泉. La和Nb共掺提高BiFeO₃的磁学性能[J]. 《材料导报》期刊社, 2018, 32(2): 176-179.
Shilie DENG,Huimin XIAN,Xi CHEN,Lingyun TANG,Jiang ZHANG,Zhongquan MAO. Enhanced Magnetic Properties of Bismuth Ferrite by La and Nb Co-doping. Materials Reports, 2018, 32(2): 176-179.

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https://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.003 或 https://www.mater-rep.com/CN/Y2018/V32/I2/176

图1 Bi1-xLaxFe0.99Nb0.01O3系列样品的(a)XRD谱和(b)XRD局部放大谱

表1 BFO和Bi1-xLaxFe0.99Nb0.01O3样品精修结果

图2 Bi1-xLaxFe0.99Nb0.01O3样品的(a)晶格常数和(b)Fe-O-Fe键角与掺杂量x的关系

图3 Bi1-xLaxFe0.99Nb0.01O3样品的拉曼衍射谱

图4 BLFNO样品的SEM图

图5 BFO和Bi1-xLaxFe0.99Nb0.01O3样品的Fe2p 3/2 XPS拟合峰

图6 (a)BLFNO样品的磁滞回线;(b)BLFNO样品剩余磁化强度与x,y的关系(其中BiFe1-yNbyO3样品的数据来自文献[10])

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