Powders of Sm(Fe,Co)_11.2Ti_0.8 alloys modified with Sc, Nb and Zr, as well as with additional Ti were prepared by reducing mechanically activated raw oxides with Ca metal in the furnace preheated to 990–1250 °C. Expansion of the crystal lattice upon introduction of Nb or additional Ti implies that atoms of these elements replace the smaller Fe atoms in the tetragonal ThMn₁₂-type structure. On the other hand, contraction of the lattice upon introduction of Sc or Zr was smaller than what was expected for replacement of the Sm atoms, which suggests that the Sc and Zr atoms replace both the Sm and Fe atoms. Washing away the reduction byproducts expands the crystal lattice of the 1:12 particles and increases their coercivity. The lattice expansion associated with the washing is believed to be caused by interstitial H atoms; more research, however, is needed to establish the mechanism(s) of the washing effect on the coercivity. The earlier reported development of a high coercivity in zirconium-modified monocrystalline particles achieved by increasing the reduction annealing temperature to ≈1200 °C was similarly characteristic of the particles modified with Sc (the coercivity reaches 11.5 kOe) and Nb (8.1 kOe), but not for the particles prepared with additional Ti where the maximum coercivity of 8.3 kOe develops for a lower annealing temperature. It is concluded that Sc, Nb and Zr modify the high-temperature phase equilibria of the Sm(Fe,Co)_11.2Ti_0.8 alloys allowing for an effective high-temperature processing, whereas the alloy coercivity increases with the synthesis temperature through a different, still unknown mechanism which may involve suppression of the defects specific to the 1:12 crystals.

Sm(Fe,Co) _11.2 Ti _0.8合金粉末通过 Sc、Nb 和 Zr 以及额外的 Ti 改性，通过在预热至 990-1250 °C 的炉中用 Ca 金属还原机械活化的原始氧化物来制备。引入 Nb 或额外的 Ti 后晶格的扩展意味着这些元素的原子取代了四方 ThMn _{12 中}较小的 Fe 原子型结构。另一方面，引入 Sc 或 Zr 时的晶格收缩小于预期取代 Sm 原子的情况，这表明 Sc 和 Zr 原子取代了 Sm 和 Fe 原子。冲走还原副产物会扩大 1:12 粒子的晶格并增加其矫顽力。与洗涤相关的晶格膨胀被认为是由间隙 H 原子引起的；然而，需要更多的研究来确定清洗效果对矫顽力的作用机制。早先报道的通过将还原退火温度提高到 ≈1200 °C 实现的锆改性单晶颗粒的高矫顽力的发展与用 Sc（矫顽力达到 11.5 kOe）和 Nb（8.1 kOe）改性的颗粒相似，但对于用额外的 Ti 制备的颗粒而言，在较低的退火温度下会产生 8.3 kOe 的最大矫顽力。结论是 Sc、Nb 和 Zr 改变了 Sm(Fe,Co) 的高温相平衡_11.2 Ti _0.8合金允许进行有效的高温加工，而合金矫顽力通过不同的、仍然未知的机制随着合成温度的增加而增加，该机制可能涉及抑制 1:12 晶体特有的缺陷。