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A new unit cell with a=2.0595nm, b=0.7574nm, c=1.0949nm and β=107.34° is proposed for the monoclinic Al 45 Cr 7 in which icosahedra form chains in the monoclinic direction as well as triangular chains on (111¯). The main building block in the monoclinic Al 45 Cr 7 , the orthorhombic ɛ-Al 4 Cr, and the hexagonal μ-Al 4 Cr is the 2I3 cluster consisting...
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