| 纳米复合永磁合金Nd9Fe85-xB6Mnx的XAFS研究 |
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| 引用本文： | 卞清,徐岚.纳米复合永磁合金Nd9Fe85-xB6Mnx的XAFS研究[J].解放军理工大学学报,2002,3(3):85-88. |
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| 作者姓名： | 卞清 徐岚 |
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| 作者单位： | 卞清（解放军理工大学理学院,江苏,南京,211101）;徐岚（解放军理工大学理学院,江苏,南京,211101） |
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| 基金项目： | 国家自然科学基金(No.19604011)以及中国科学院"百人计划"基金资助项目. |
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| 摘 要： | 为了研究淬火速度及Mn掺杂对纳米复合Nd-Fe－B磁性材料微结构的影响,利用XAFS技术对不同淬火速度的Nd9Fe84.5B6Mn0.5样品及退火和未退火的Nd9Fe84.5B6Mn0.5（x－0．5和1．0）样品,进行了Fe原子局域结构的分析。结果表明,纳为复合Nd9Fe84.5B6Mn0.5噘性材料随着淬火速度的增另,Fe原子的最近邻配位距离单上,而配位无序度的变化较为复杂。退火前,掺杂微量Mn原子进入磁体的Nd2Fe14B主相晶体结构,掺杂量不同对主相局域结构的影响有明显差异。退火后,Mn原子退出磁体的主相结构,进入晶界或产生富集,没有发现掺杂量不同对主相局域 结构的影响,但对整个磁体的磁性仍然有不同的影响。
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| 关 键 词： | 纳米复合材料 X射线吸收精细结构 NdFeB合金 交换耦合作用 |
| 文章编号： | 1009-3443(2002)03-0085-04 |
| 修稿时间： | 2001年11月25 |
XAFS Studies of Nd9Fe 85-x B6Mnx Nanocomposite |
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| BIAN Qing and XU Lan.XAFS Studies of Nd9Fe 85-x B6Mnx Nanocomposite[J].Journal of PLA University of Science and Technology(Natural Science Edition),2002,3(3):85-88. |
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| Authors: | BIAN Qing and XU Lan |
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| Institution: | Institute of Sciences, PLA Univ. of Sci. & Tech., Nanjing 211101, China;Institute of Sciences, PLA Univ. of Sci. & Tech., Nanjing 211101, China |
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| Abstract: | In order to study the effect of Mn addition and quenching speed on Nd Fe B alloy, the local structures of the Nd 9Fe 85 x B 6Mn x ( x =0.5 and 1.0)nanocomposite manufactured at different quenching speed and under different annealing condition have been investigated by XAFS. It is showed that the first coordination distance of Fe atom in the Nd 9Fe 84.5 B 6Mn 0.5 alloy decreases with the quenching speed, and the change of the disorder factor is complex. Before annealing some Mn atoms enter main lattice of the Nd 9Fe 85 x B 6Mn x (x =0.5 and 1.0) nanocomposite,and its effect on main lattice is different for x =0.5 and 1.0.Afert annealing the structures of main lattice are same for x =0.5 and 1.0 because of Mn leaving,but the effect of Mn atoms on the magnetism of the Nd 9Fe 85 x B 6Mn x nanocomposite is different for x =0.5 and 1.0. |
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| Keywords: | nanocomposite X ray absorption fine structure NdFeB alloy exchange coupling effect |
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