| La和Nb共掺提高BiFeO3的磁学性能 |
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| 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,2018(1):176-179,188. |
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| 作者姓名： | 邓施列 冼慧敏 陈熹 唐玲云 张弜 毛忠泉 |
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| 作者单位： | 华南理工大学物理与光电学院,广州,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Fe3+和Fe2+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FeO5八面体结构变化,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 bismuth ferrite doping magnetic properties lattice distortion |
Enhanced Magnetic Properties of Bismuth Ferrite by La and Nb Co-doping |
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| DENG Shilie,XIAN Huimin,CHEN Xi,TANG Lingyun,ZHANG Jiang,MAO Zhongquan.Enhanced Magnetic Properties of Bismuth Ferrite by La and Nb Co-doping[J].Materials Review,2018(1):176-179,188. |
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| Authors: | DENG Shilie XIAN Huimin CHEN Xi TANG Lingyun ZHANG Jiang MAO Zhongquan |
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| 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 Fe3+ to Fe2+ 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. |
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