Intermetallic compounds based on rare-earth metals and iron are by far the most promising materials for permanent magnets. In this work, the multicomponent compound Sm_1.2Ho_0.8Fe₁₇ was prepared by induction melting. The hydride Sm_1.2Ho_0.8Fe₁₇H_4.4 with a high hydrogen content was obtained by direct hydrogenation of the intermetallic compound. The rhombohedral Th₂Zn₁₇-type of structure (space group $R\overline{3}m$) is inherent to parent compound and hydride as well. The effect of hydrogenation on the magnetic properties of Sm_1.2Ho_0.8Fe₁₇ was investigated. Curie temperature of the hydride Sm_1.2Ho_0.8-Fe₁₇H_4.4 is higher than that of parent compound by ΔT_C = 138 K. The hydrogen embedded in Sm_1.2Но_0.8Fe₁₇ crystal lattice increases the saturation magnetization (σ_S) at T = 300 K, but does not significantly affect σ_S at Т = 4.2 K. The ferrimagnetic structure is retained in magnetic fields up to 58 T in the parent compound, while, in the hydride, there is a spin-reorientation phase transition observed at 55 T. It is found that the parameter of the intersublattice exchange interaction decreases significantly in the hydride Sm_1.2Ho_0.8Fe₁₇H_4.4 (and in the nitride Sm_1.2Ho_0.8Fe₁₇N_2.4) which is associated with boosting of the unit-cell volume and distances between magnetic ions.

基于稀土金属和铁的金属间化合物是迄今为止最有前途的永磁材料。在这项工作中，多组分化合物 Sm _1.2 Ho _0.8 Fe ₁₇是通过感应熔化制备的。通过金属间化合物的直接氢化得到具有高氢含量的氢化物Sm _1.2 Ho _0.8 Fe ₁₇ H _4.4。菱面体 Th ₂ Zn ₁₇型结构（空间群$\mathrm{电阻}\overline{3}米$) 也是母体化合物和氢化物固有的。研究了氢化对Sm _1.2 Ho _0.8 Fe ₁₇磁性能的影响。氢化物 Sm _1.2 Ho _0.8- Fe ₁₇ H _{4.4 的}居里温度比母体化合物高 Δ T _C  = 138 K。嵌入 Sm _1.2 Но _0.8 Fe ₁₇晶格中的氢增加了饱和磁化强度 ( σ _S ) T  = 300 K，但不会显着影响Т处的σ _S = 4.2 K。在母体化合物中，亚铁磁结构保留在高达 58 T 的磁场中，而在氢化物中，在 55 T 处观察到自旋重定向相变。氢化物 Sm _1.2 Ho _0.8 Fe ₁₇ H _4.4（以及氮化物 Sm _1.2 Ho _0.8 Fe ₁₇ N _2.4）中的相互作用显着降低，这与晶胞体积和磁性离子之间距离的增加有关。