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Phase stability of ternary M2AlB2. Schematic illustration of M2AlB2 with (a) orthorhombic Cmmm and (b) hexagonal P6̅m2 symmetry with unit cells marked by black lines. (c) Calculated theoretical phase stability for M2AlB2, identifying whether Cmmm (square) or P6̅m2 (hexagon) is lowest in energy. Experimentally known phases are marked with a black box.
