We studied the effect of Mn on the structure and properties of Cd_3−xMn_xAs₂ crystals with x = 0–0.24, synthesized by direct fusion of high-purity elements. Obtained X-ray diffraction patters suggest that the incorporation of Mn promotes a structural phase transition from primary α-Cd₃As₂ (x = 0) phase to the α''– Cd₃As₂ (x = 0.24) phase, while at intermediate compositions both phases can coexist. In addition, the increase of Mn content results in the decrease of lattice cell parameters, which effectively saturates for x > 0.13. Microstructural, calorimetric and magnetometry studies suggest that at high Mn content (x = 0.24) secondary MnAs phase appears. Using obtained results, we estimated the solubility limit of Mn in Cd₃As₂ as x~0.13, which corresponds to the formation of ternary Cd_3−xMn_xAs₂ compound where Cd atoms are partially substituted by Mn. Formation of ternary compound was also suggested by the results for Cd₃As₂ + MnAs composite systems, where we also observed the presence of CdAs₂ phase, which is a byproduct of corresponding reaction. Additional studies suggested that the CdAs₂ phase formation in composite system can be prevented if one uses the Cd_3−xMn_xAs₂ compound instead of pure Cd₃As₂ as a matrix material.

我们研究了 Mn 对 Cd _3-x Mn _x As ₂晶体结构和性质的影响，其中x  = 0-0.24，由高纯度元素直接熔融合成。获得的 X 射线衍射图表明，Mn 的掺入促进了从初级 α-Cd ₃ As ₂ ( x  = 0) 相到 α''– Cd ₃ As ₂ ( x  = 0.24) 相的结构相变，而在中间组成 两相可以共存。此外，Mn 含量的增加导致晶格参数的降低，这对于x有效饱和 > 0.13。显微结构、量热法和磁力计研究表明，在高 Mn 含量 ( x  = 0.24) 时会出现二次 MnAs 相。使用获得的结果，我们估计 Mn 在 Cd ₃ As _{2 中}的溶解度极限为x ~0.13，这对应于三元 Cd _3-x Mn _x As ₂化合物的形成，其中 Cd 原子被 Mn 部分取代。Cd ₃ As ₂ + MnAs 复合系统的结果也表明三元化合物的形成，我们还观察到 CdAs ₂相的存在，这是相应反应的副产物。其他研究表明 CdAs如果使用Cd _3-x Mn _x As ₂化合物代替纯Cd ₃ As ₂作为基体材料，可以防止复合体系中的_二相形成。