【摘要】 利用单晶X射线衍射并与装配能量色散X射线能谱的扫描电镜相结合对化学计量比为74∶20∶6的Al粉、Mn粉与Si粉的放电等离子烧结析出物进行表征，发现了一种空间群为■的新型立方准晶近似相α′-AlMnSi。新相与约60年前报道的具有■空间群的简单立方相α-AlMnSi原子占位略有不同，尽管两者具有相近的晶格参数。通过与α-AlMnSi、α-AlFeSi和α-AlReSi精细晶体结构模型的比较，发现α-AlMnSi■到■的转变主要是Al原子的劈裂导致。最后用纳米团簇法分析了α′-AlMnSi相的拓扑构建单元。更多还原

【Abstract】 A new cubic quasicrystal approximant phase α′-AlMnSi, with space group ■ was discovered from the educts obtained by spark plasma sintering of mixed Al, Mn and Si in the stoichiometric ratio 74∶20∶6 and determined by mainly by single-crystal X-ray diffraction combined with scanning electron microscope equipped with energy dispersive X-ray spectroscopy.The new phase is different from the previously reported primitive cubic phase α-AlMnSi with space group ■ although they have quite similar lattice parameters.The refined structural model of the new phase has been compared with available refined crystal structure models of α-AlMnSi, α-AlFeSi as well as α-AlReSi, which suggest that the transformation between the α-AlMnSi ■ to the ■ is dominated by the splitting of Al atoms.Finally, the topological building units of the α′-AlMnSi phase has been analyzed in detail by the nanocluster method.更多还原