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  • 1995-1999  (2)
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  • 1
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: x (SiO2)1-x and Fex(SiO2)1-x by conducting atomic force microscopy (C-AFM). The conducting networks (CNs) were mapped via current images using the constant bias mode of C-AFM. By combining the topographic and electric current images simultaneously, the conducting phase can be identified from the insulator matrix. A rapid increase of the conducting phase was observed when x crossed the percolation threshold xc. Therefore the percolation was directly “seen” on a nanometer scale. With this technique, C-AFM is not only a “topographic profiler” but also a “chemical profiler” if the volume fraction of metal phase exceeds the percolation threshold. The factors limiting the lateral resolution will also be discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 2 at temperatures ranging from 600 to 1200 °C for 2 h. Rutherford backscattering spectrometry (RBS) analysis revealed carbon distribution and the formation of an SiC layer. Infrared spectroscopy (IR) exhibited a sharp absorption peak produced by the Si-C bond at 795 cm-1 with full width at half maximum (FWHM) of about 35 cm-1. A layer of crystalline SiC was formed after annealing the as-implanted sample at 1000 °C for 2 h. The influence of annealing temperature on the surface morphology and the dynamics of the crystallization procedure was studied by atomic force microscopy (AFM). A study of grain size and roughness revealed that the morphology of the SiC layer was largely dependent on annealing temperature, and the average grain size increased as the annealing temperature was raised. At about 900 °C, a layer of nanocrystalline SiC was formed on the sample surface, containing columnar grains with a FWHM of tens of nanometers and a height of less than ten nanometers.
    Type of Medium: Electronic Resource
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