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《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Bi1-xLaxFe0.99Nb0.01O3(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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邓施列
冼慧敏
陈熹
唐玲云
张弜
毛忠泉
关键词:  铁酸铋  掺杂  磁学性能  晶格畸变    
Abstract: 

In the present work, a series of Bi1-xLaxFe0.99Nb0.01O3 (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.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.003  或          http://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
Sample Lattice parameter/?,Vol/?3 Bi-O/? Fe-O/? Fe-O-Fe/(°) Refined factors
BFO a=5.573 9(1), c=13.856 2(3)
V=372.81(1)		 2.292 9 1.853 9
2.192 1		 156.381 Rwp=6.05%
χ2=2.416
x=0.00 a=5.576 7(3), c=13.829 3(14)
V=372.46(1)		 2.212 4 1.850 0
2.200 1		 155.575 Rwp=7.17%
χ2=3.378
x=0.05 a=5.576 7(1), c=13.837 9(4)
V=372.70(2)		 2.309 9 1.832 2
2.220 6		 155.372 Rwp=5.57%
χ2=2.095
x=0.10 a=5.579 3(1), c=13.817 3(4)
V=372.48(2)		 2.364 8 1.773 4
2.278 4		 155.321 Rwp=6.59%
χ2=2.886
x=0.15 a=5.582 1(1), c=13.789 5(7)
V=372.11(2)		 2.317 1 1.750 6
2.303 0		 154.866 Rwp=6.42%
χ2=2.599
x=0.20 a=5.581 8(3), c=13.767 6(18)
V=371.48(2)		 2.165 2 1.811 4
2.243 8		 154.464 Rwp=7.97%
χ2=3.717
x=0.25 a=5.584 4(3), c=13.744 4(28)
V=371.20(2)		 2.232 5 1.807 7
2.250 8		 153.991 Rwp=7.86%
χ2=4.057
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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