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  • Electronic Resource  (2)
  • 1995-1999  (2)
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  • Electronic Resource  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Feasibility of covalent quasicrystals (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 1191-1194 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An algorithm for constructing a quasicrystalline structure based on atoms with tetrahederal coordination of covalent atomic bonds (the typical coordination for group IV atoms) is proposed. The algorithm is used to construct a computer model of a cluster with icosahedral symmetry. The model is used to estimate the energy parameters of the structure and the distributions of bonds over interatomic bond lengths and interbond angles. The distributions obtained correlate well with the analogous results for silicon glasses and do not impose any fundamental constraints on the implementation of such structures in practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558611
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nature of soft vibrational modes in metallic glasses (1999)
    Springer
    Physics of the solid state 41 (1999), S. 334-340 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A general theory of vibrational excitations in metallic glasses is presented, based on the disclination model of the structure of solids with local icosahedral symmetry. The representation of nonorthogonal plane waves is used, which allows one to separate the diagonal terms in the Hamiltonian, and also the terms describing scattering of these waves by fluctuations of the density and the force constants, and by topological structure fluctuations. We have derived and solved the Dyson equation for the Green’s function. We have obtained an analytical expression for the density of vibrational states of the glass. The nature of the soft vibrational modes is discussed. It is shown that these modes are resonant modes, whose presence is due to the fluctuations of the density and the force constants. Special attention is given to the role of forward scattering and the nature of the spatial variation in the amplitude of the given modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130778
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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