Polytypism in a decagonal quasicrystalline Al–Co phase
- 1 April 1989
- journal article
- research article
- Published by International Union of Crystallography (IUCr) in Journal of Applied Crystallography
- Vol. 22 (2) , 96-99
- https://doi.org/10.1107/s0021889888011409
Abstract
A decagonal quasicrystalline phase has been produced in rapidly solidified binary Al–14 to 25 at.% Co and ternary Al–20 at.% Co–5 at.% Si alloys. Observation of periodicity along one of the directions in the electron diffraction patterns has confirmed the decagonal nature of the phase. Variations in periodicity ranging from 4 to 16 Å suggest that a polytypism-like phenomenon occurs in these phases. By in situ hot-stage electron microscopy, it can be shown that one polytype transforms into another. Reasons for the formation and transformation of polytypes in decagonal quasicrystalline phases are discussed.Keywords
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