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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 2 (1998), S. 409-412 
    ISSN: 1434-6036
    Keywords: PACS. 68.55.-a Thin film structure morphology - 05.70.Ln Nonequilibrium thermodynamics, irreversible processes - 81.10.Aj Theory and models of crystal growth; physics of crystal growth, crytal morphology and orientation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Two types of mechanisms are proposed for mound coarsening during unstable epitaxial growth: stochastic, due to deposition noise, and deterministic, due to mass currents driven by surface energy differences. Both yield the relation H=(RWL)2 between the typical mound height W, mound size L, and the film thickness H. An analysis of simulations and experimental data shows that the parameter R saturates to a value which discriminates sharply between stochastic ( ) and deterministic ( ) coarsening. We derive a scaling relation between the coarsening exponent 1/z and the mound-height exponent which, for a saturated mound slope, yields .
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 49 (1999), S. 1531-1536 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twofold-, threefold-, and fivefold-symmetry elements are observed in the near-surface region of the quasicrystal Al70Pd20Mn10 using a real-space imaging technique based on secondary-electron emission. The observed icosahedral point-group symmetry implies the presence of atomic clusters within the analyzed region of the solid. The same surface produces perfect low-energy electron diffraction patterns typical for well-defined crystallographic planes. We present a model which reconciles this dual structural nature of quasicrystals. Our model is constructed from an icosahedral seed followed by concentric symmetry-preserving “growth” to form the macroscopic solid.
    Type of Medium: Electronic Resource
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