Abstract
A two-dimensional decagonal quasicrystal (DQC) has been found in binary Al-Co alloys in the composition range Al11Co4 to Al10Co4 after slow solidification from the melt. The crystalline phase found most frequently coexisting with this DQC is two new structure variants, oneC-centered and the other primitive, of the monoclinic layer compound Al13Co4. Theira andc parameters are roughly τ2 times (τ = (1 + √5)/2 = 1.6180…) larger than the corresponding ones in Al13Co4. Moreover, a new orthorhombic phase Al3Co or Al11Co4 (Pnmn, a = 1.25 nm,b = 0.81 nm, andc = 1.46 nm) has also been found. As shown by the characteristic electron diffraction patterns (EDPs), these crystalline phases can be considered as approximate structures of the DQC. The lattice relationship between these phases has been discussed.
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