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  • 1
    Electronic Resource
    Electronic Resource
    Thermal configurations of oxygen in silicon (1992)
    Springer
    Applied physics 55 (1992), S. 317-323 
    Details
    ISSN: 1432-0630
    Keywords: 61.70.−r ; 71.55.−i ; 81.40.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The central position and the infrared absorption coefficient of the 9 μm band of Si samples were measured with Fourier transform infrared spectroscopy (FTIR) at temperatures from T=77 K to 775 K. The infrared absorption coefficients were corrected by considering background absorption and free carrier absorption calculated from the increased free carrier concentration and from the resistivity determined from Hall effect measurements. We found the central position of the 9 μm band to shift to longer wavelengths with increasing temperature. The concentration [Oi] of interstitial oxygen is almost constant for T〈600 K, but decreased rapidly for T〉600 K. These results verified there are two types of thermal configurations of oxygen in silicon: The bonded Si2O configuration with a binding energy E b≈0.8 to 1.0 eV at T≈77 K to 600 K, and the Si2O configuration coexists with a quasi-free interstitial oxygen (QFIO) state for T〉600 K. The lattice potential barrier E L, which retards QFIO atoms from migrating in the lattice, is estimated to be 1.5 to 1.6 eV. From these configurations the anomalous diffusivity of oxygen in silicon can be explained quite well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324078
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution rlectron microscopic investigation of supported platinum particles reduced at high temperatures (1988)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 10 (1988), S. 7-14 
    Details
    ISSN: 0741-0581
    Keywords: HREM ; Supported particle ; SMSI ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: High-resolution electron microscopy has been used to characterize the platinum particles supported on TiO2 or ZnO. After reduction at elevated temperatures, the metallic particles display a regular, faceted shape, and several superstructures, Pt3 Ti(C), Pt3 Ti(H), PtTi, and PtZn, have been found. These results, which may involve strong metal-support interaction, have been confirmed by optical diffraction and image simulation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060100103
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    Paper (German National Licenses)
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