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Keywords:

  • 02.70.Bf;
  • 63.10.+a;
  • 63.22.+m

Abstract

Acoustic transmission through slabs of two-dimensional composites modeling nanoceramics obtained by compacting in the presence of a plasticizer, is studied by the finite-difference time-domain (FDTD) method. A frequency analysis of the signal transmitted through a composite slab suggests that in the phonon spectrum of such systems there exists a gap, the position of which coincides with the gap location in an infinite disordered periodic composite. The effect of the dispersion of the grain-size distribution function on the acoustic transmission in ceramics is investigated. The possibility of using such systems as insulators and filters for gigahertz-range elastic waves is discussed. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)