The microcrystalline state of slowly solidified decaprismatic Al-Co-Cu(-Si) needles |
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| Authors: | R Wittmann M Fettweis P Launois R Reich F Dénoyer |
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| Institution: | 1. Laboratoire de Physique des Solides (associé au CNRS) , B[acaron]timent 510 Université Paris-Sud, F-91405, Orsay Cedex, France;2. Laboratorium für Elektronenmikroskopie, Universit?t Karlsruhe , Postfach 6980, D-76128, Karlsruhe, Germany;3. Laboratoire de Physique des Solides (associé au CNRS) , B[acaron]timent 510 Université Paris-Sud, F-91405, Orsay Cedex, France |
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| Abstract: | Abstract We show that samples of the decagonal Al-Co-Cu(-Si) phase produced by different slow solidification methods are in the microcrystalline and not in the quasicrystalline state. Parameters for the underlying unit cell are a = b ≈ 51.3 Å, c ≈ 4.1 Å and γ = 108°. Experiments on differently produced samples show the same microcrystalline state and that the (5,7) approximant seems to be highly favoured, compared with the set of possible high-order approximant states. |
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