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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 Nd9Fe85-x B6Mnx( 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 ,纳米复合 Nd9Fe84.5B6Mn0 .5磁性材料随着淬火速度的增加 ,Fe原子的最近邻配位距离单调减小 ,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 Nd2 Fe14 B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
In order to study the influence of quenching rate and Mn doping on the microstructures of nanocomposite Nd-Fe-B magnetic materials, X-ray diffraction (XAFS) techniques were used to analyze Nd9Fe84.5B6Mn0.5 samples with different quenching rates and Nd9Fe85-xB6Mnx (x = 0 .5 and 1 .0) samples were analyzed for the local structure of Fe atoms. The results show that with the increase of quenching rate, the nearest neighbor coordination distance of Fe atoms decreases monotonically, while the change of coordination disorder degree is more complicated than that of Nd9Fe84.5B6Mn0.5 nanomaterials. Before annealing, the main phase structure of Nd2Fe14B doped with a small amount of Mn atoms into the magnet has significant differences in the influence of the doping amount on the local structure of the main phase. After annealing, the Mn atoms exit the main phase structure of the magnet and enter the grain boundary or generate enrichment. The effect of different doping amount on the local structure of the main phase is not found, but the magnetic properties of the whole magnet still have different effects