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Polytypism in a decagonal quasicrystalline Al–Co phase
Author(s) -
Me J.,
Suryanarayana C.,
Singh G.
Publication year - 1989
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889888011409
Subject(s) - quasicrystal , phase (matter) , crystallography , ternary operation , materials science , electron diffraction , electron microscope , diffraction , chemistry , physics , optics , organic chemistry , computer science , programming language
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.