Elastic constants and anisotropic internal frictions of decagonal Al 72Ni18Co8 single quasicrystal at low temperatures

R. Tarumi, H. Ledbetter, S. Shiomi, H. Ogi, M. Hirao, A. P. Tsai

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    Abstract

    We studied the complete set of elastic constants Cij and internal frictions tensor Qij-1 of anisotropic decagonal Al72Ni18Co8 single quasicrystal by electromagnetic acoustic resonance at low temperatures, to 5 K. Most C ij(T) showed usual stiffening upon cooling and their temperature behaviors are well characterized by an Einstein-lattice-vibration model. The average Grüneisen parameter estimated from the bulk modulus is 2.4, almost identical to crystalline Al. Ambient temperature Qij-1 show a linear relationship to the elastic-constants temperature derivatives |dCij/dT|/Cij with a slope of 1.28 K-1, suggesting that lattice anharmonicity plays a dominant role for Q ij-1. The longitudinal modulus for the decagonal axis C33 and corresponding internal friction Q33-1, however, showed significant deviation from such ideal behavior, suggesting additional low-frequency phonon-excitation modes along the decagonal axis.

    Original languageEnglish
    Article number013514
    JournalJournal of Applied Physics
    Volume108
    Issue number1
    DOIs
    Publication statusPublished - 2010 Jul 1

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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