Thermal Expansion And Grüneisen Parameters Of Quasicrystals

DOI

Search this article

Description

<jats:title>Abstract</jats:title><jats:p>To investigate anharmonic phonon properties, thermal expansion measurements have been performed for icosahedral (i-) Al-Pd-Mn and decagonal (d-) Al-Cu-Co quasicrystals by X-ray diffractometry in the temperature range between 100 and 800K. The linear thermal expansion coefficient α(<jats:italic>T</jats:italic>) of i-Al-Pd-Mn is 1.1 × 10<jats:sup>−5</jats:sup>K<jats:sup>−1</jats:sup> at 300K, which is about a half of that of pure Al phase. The measured α(<jats:italic>T</jats:italic>) of d-Al-Cu-Co coincides almost completely with that of i-Al-Pd- Mn and no appreciable anisotropy was detected between the tenfold periodic direction and a quasiperiodic direction perpendicular to it. The Grfneisen parameter γ(<jats:italic>T</jats:italic>), has been evaluated from the measured α(<jats:italic>T</jats:italic>) using the data of lattice specific heat and elastic moduli previously reported. The γ(<jats:italic>T</jats:italic>) values for the two phases are comparable to those for conventional metallic crystals and almost constant over the temperature range studied.</jats:p>

Journal

  • MRS Proceedings

    MRS Proceedings 553 1998-01-01

    Springer Science and Business Media LLC

Details 詳細情報について

Report a problem

Back to top