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The quasicrystals are a new class of materials with a new type of crystal structure and a symmetry which is inconsistent with the rules of classical crystallography. The electron diffraction patterns exhibit twofold, threefold and fivefold symmetry (icosahedral quasicrystals). In addition to these three-dimensional quasicrystals, two-dimensional quasicrystals with tenfold rotational symmetry (decagonal quasicrystals) have also been found. The growth morphology of the quasicrystals is rhombic-triacontahedral, pentagonal-dodecahedral, icosidodecahedral in the icosahedral phases and columnar or decaprismatic in the decagonal phase. About 150 samples of ternary Al-Cu-U, Al-Cu-M (M = Ru, Rh, Re, Ir) and quaternary Al-Cu-Ru-U alloys were prepared by arc-melting or splat-cooling. The samples were characterised by various techniques such as X-ray diffractometry, differential thermal analysis (DTA), transmission and scanning electron microscopy (TEM, SEM). This paper describes and documents the results of these experiments.

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Authors: ATHANASIOU N, JRC Karlsruhe (DE);RAY I, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);POLITIS C, Kernforschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik (DE)
Bibliographic Reference: Paper presented: 22. Journées des Actinides, Méribel (FR), April 22-24, 1992
Availability: Text not available
Record Number: 199210807 / Last updated on: 1994-12-02
Original language: en
Available languages: en