Synthesis of atomically layered and chemically ordered rare-earth (RE) i-MAX phases; (Mo2/3RE1/3)2GaC with RE?=?Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu

摘要

We report the synthesis of eight new members of the i -MAX family, of the formula (Mo_(2/3)RE_(1/3))_(2)GaC, where RE?=?Gd, Tb, Dy, Ho, Er, Tm, Lu, and Yb, the latter not previously incorporated in a MAX phase. The structure and composition of powder samples were investigated by X-ray diffraction, scanning transmission electron microscopy, and energy dispersive X-ray analysis combined with scanning electron microscopy. All phases showed evidence of an orthorhombic (Cmcm ) structure, and the phases based on Er and Yb also crystallized in a monoclinic (C 2/c ) arrangement. The chemical order of the magnetic elements suggests interesting magnetic characteristics, with a high tuning potential through the range of attainable lanthanide elements.