Abstract
The binary Al-Co decagonal quasicrystal (DQC) is stable between 800 °C and 900 °C and transforms to a primitive monoclinic phase (a = 3.984 nm,b = 0.8148 nm,c = 3.223 nm, and β = 107.97 deg) above 950 °C or below 750 °C. The composition of this crystalline approximant is similar to theC-centered monoclinic Al13Co4 but witha andc parameters τ2 (τ = (1 + √5)/2 = 1.61803. . .) times larger. This τ2-A113Co4 occurs frequently as (001) and (100) twins. The transformation of the Al-Co DQC to (100) twins of τ2-A113Co4 has been followed by selected-area electron diffraction. With reference to the main zonal electron diffraction patterns and the X-ray diffractogram of the Al-Co DQC, the X-ray powder diffractogram of τ2-A113Co4 with a giant unit cell can be successfully indexed.
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