title: High-temperature structural study of decagonal Al-Cu-Rh.
abstract: The structure of decagonal Al-Cu-Rh has been studied as a function of temperature by in-situ single-crystal X-ray diffraction in order to contribute to the discussion on energy or entropy stabilization of quasicrystals. The experiments were performed at 293, 1223, 1153, 1083 and 1013 K. A common subset of 1460 unique reflections was used for the comparative structure refinements at each temperature. A comparison of the high-temperature datasets suggests that the best quasiperiodic ordering should exist between 1083 and 1153 K. However, neither the refined structures nor the phasonic displacement parameter vary significantly with temperature. This indicates that the phasonic contribution to entropy does not seem to play a major role in the stability of this decagonal phase in contrast to other kinds of structural disorder, which suggests that, in this respect, this decagonal phase would be similar to other complex intermetallic high-temperature phases.
authors.affiliation: AGH University of Science and Technology, al. Mickiewicza 30, Krakow, Poland.
authors.forename: Pawel
authors.initials: P
authors.lastname: Kuczera
authors.affiliation: AGH University of Science and Technology, al. Mickiewicza 30, Krakow, Poland.
authors.forename: Janusz
authors.initials: J
authors.lastname: Wolny
authors.affiliation: Laboratory of Crystallography, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland.
authors.forename: Walter
authors.initials: W
authors.lastname: Steurer
keywords: decagonal quasicrystal; high-temperature structure; stabilization mechanism