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稀土(R)富过渡族金属(T)化合物是探索新型稀土永磁材料的主要研究对象,其磁性能与晶体结构密切相关。本文系统综述了我们近年来针对二元化合物不存在的情况下,通过第三组元M的稳定作用,合成和稳定具有CaCu5型衍生结构的化合物Rm-nT5m+2n(包括R(T,M)7,R2(T,M)17,R3(T,M)29和R(T,M)12),具有NaZn13型结构的化合物R(T,M)13,以及m层RT5和n层RT3B2组合的化合物Rm+nT5m+3nB2n等方面的主要研究结果。重点讨论了这些化合物的晶体结构、形成条件和磁性能,阐述了加入M对化合物的稳定作用机制,及M的晶体学占位对磁性能的影响。研究结果表明:M的加入不仅能够起到稳定化合物的作用,往往还可以显著改善化合物的磁性能。
The rare earth (R) rich transition metal (T) compounds are the main research objects to explore the new rare earth permanent magnet materials, and their magnetic properties are closely related to the crystal structure. In this paper, we systematically reviewed the recent progress in the synthesis and stabilization of a compound Rm-nT5m + 2n (including R (T, M) 7, R2 (T, M) 17, R3 (T, M) 29 and R (T, M) 12), a compound R (T, M) 13 having a NaZn13 type structure and a combination of a m-layer RT5 and an n-layer RT3B2 Of the compounds Rm + nT5m +3 nB2n and other aspects of the main findings. The crystal structure, formation conditions and magnetic properties of these compounds are discussed in detail. The stabilizing mechanism of M on the compounds and the influence of M on the magnetic properties are also discussed. The results show that the addition of M can not only stabilize the compound, but also improve the magnetic properties of the compound.