Dynamics in the melt of an icosahedral Al72Pd 20Mn8 quasicrystal

J. T. Okada, M. Inui, D. Ishikawa, A. Q.R. Baron, K. Matsuda, S. Tsutsui, Y. Watanabe, S. Nanao, T. Ishikawa

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The dynamic structure factor S(Q,ω) of the melt of an icosahedral quasicrystal, Al72Pd20Mn8, was measured at 1223K near the melting point, Tm ≤ 1140K, for momentum transfers, Q, from 1.5 to 27.15nm-1 by means of an inelastic x-ray scattering technique using synchrotron radiation at SPring-8. The composition of Al 72Pd20Mn8 is a special one in AlPdMn ternary alloys, since an icosahedral AlPdMn quasicrystal is formed from the melt. The acoustic mode was observed in the low-Q region, and a substantial broadening of the longitudinal current-current correlation function and the crossover of the effective sound velocity from hydrodynamic to viscoelastic regions were observed around 6nm-1, which hints at the existence of a cluster with a size of about 1nm in the melt.

Original languageEnglish
Article numberL03
Pages (from-to)L613-L618
JournalJournal of Physics Condensed Matter
Issue number49
Publication statusPublished - 2006 Dec 13


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