Abstract
The presence of a monoclinic Τ2-A113Co4 phase, whosea andc are about Τ2 = 2.618 (Τ = $$(1 + \sqrt 5 )/2)$$ times greater than the respective parameters of the monoclinic Al13Co4, and its (100) and (001) twins has been reported earlier. Like its prototype structure, the monoclinic Al13Fe4/Al13Co4, this Τ2-A113Co4 also shows a tendency to form multiple twins displaying five-fold symmetry. A transmission electron microscopic study of the twin mechanisms has been carried out. In addition to the well-known (001) and (100) glide twins, (20-1) glide twins have also been found. Alternate (100)-(20-l) or (100)-(001)-(100) twinning will yield twins display-ing fivefold symmetry. The distribution of Co atoms in the pentagonal layer in Τ2-A113Co4 and the tessellation of pentagons in the (100) and (20-1) glide twins have also been studied by high-resolution electron microscopy.
Published Version
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