The new solid solutions Ca_14−xRE_xMnBi₁₁ (RE = La–Nd, Sm, and Gd–Ho; x ≈ 0.6–0.8) were prepared by using a Pb-flux technique and structurally characterized by single-crystal X-ray diffraction. All synthesized materials crystallize in the tetragonal Ca₁₄AlSb₁₁ structure type (space group: I4₁/acd, Pearson index: tI208). The magnetic responses of all the members of the series were investigated, and for all REs in this study, except for Sm, a ferromagnetic ordering was observed at T_C = 35–44 K. The Sm-containing sample shows a ferromagnetic-like transition at 40 K and enters a long-range antiferromagnetic state below 17 K. The magnetic behavior of Ca_14−xRE_xMnBi₁₁ differs from that of the isostructural Ca_14−xRE_xMnSb₁₁ series, emphasizing the importance of the weak magnetic interactions in complex crystal structures.

中文翻译：

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晶体化学和固体溶液的磁特性的Ca _{14- X} RE _X为：MnBi ₁₁（RE =镧钕，钐，钆和何; X ≈0.6-0.8）†

新的固体溶液的Ca _{14- X} RE _X为：MnBi ₁₁（RE =镧钕，钐，钆和何; X ≈0.6-0.8）通过使用一个Pb-通量技术和结构上的特征在于单晶制备X-射线衍射。所有合成材料均以四方Ca ₁₄ AlSb ₁₁结构类型结晶（空间群：I 4 ₁ / acd，皮尔森指数：tI 208）。研究了该系列所有成员的磁响应，对于本研究中的所有稀土元素，除Sm以外，在T _C处均观察到铁磁有序= 35–44K。含Sm的样品在40 K时显示出类似铁磁的转变，并在17 K以下进入长距离反铁磁状态。Ca _{14− x} RE _x MnBi ₁₁的磁行为不同于同构Ca _{14− x} RE _x MnSb ₁₁系列，强调了复杂晶体结构中弱磁相互作用的重要性。