Ti₃[Al_1−δCu_δ]C₂ MAX phase solid solutions have been synthesized by sintering compacted Ti₃AlC₂–Cu composites produced by mechanical milling. Using X-ray and neutron diffraction techniques, it is demonstrated that the Cu mixing into the Al site is accompanied by lattice distortion, which leads to symmetry reduction from a hexagonal to a monoclinic structure. Such symmetry reduction likely results from this mixing through deviation of the A-site position from the special (0, 0, ¹/₄) position within the P6₃/mmc space group of the original Ti₃AlC₂ structure. Moreover, it is demonstrated that the Cu admixture into the A site can be adjusted from the composition of the reactant mixture. The lattice parameter variation of the solid solution compounds, with 10–50 atom % Cu in the A site, is found to be consistent with Vegard’s law.

中文翻译：

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证据对称性减少的Ti ₃（铝_1-δ铜_δ）C ₂ MAX相固溶体

的Ti ₃ [铝_1-δ铜_δ ] c ^ ₂ MAX相的固体解决方案已经通过烧结压实的Ti合成₃ ALC ₂ -Cu复合材料通过机械研磨制备。使用X射线和中子衍射技术证明，混入Al部位的Cu伴随着晶格畸变，从而导致对称性从六边形变为单斜晶结构。从该混合通过从特殊（0，0，A位的位置偏差等减少对称性可能结果¹ / ₄）的位置内P 6 ₃ / mmc的原始的Ti的空间群₃AlC ₂结构。此外，证明了可以从反应混合物的组成来调节向A位的Cu掺混物。发现固溶化合物的晶格参数变化（在A位点具有10–50原子％的Cu）符合维加德定律。