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  • 1
    Electronic Resource
    Electronic Resource
    Grains of Porous Silicon Embedded in SiO〈sub〉2〈/sub〉:Studies of Optical Gain and Electroluminescence (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 99-100 (July 2004), p. 31-36 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Recent reports on experimental observation of optical gain in silicon nanostructures in the visible region, performed at several laboratories all over the world, have triggered an extraordinary surge of interest in silicon lasing. However, attempts aimed at reproducing the red stimulated emission from „standard“silicon nanocrystals (sized 3-5 nm) at some other laboratories either failed, or. did not come to definite conclusions. Therefore, more detailed measurements of optical gain in a wider variety of samples containing Si nanocrystals are required in order to unravel whether or not the observation of optical gain is an intrinsic property of Si nanocrystals. We have performed a detailed study of optical gain in layers of densely packed Si nanocrystals in SiO2, prepared on the basis of porous Si, using the variable-stripe-length (VSL) method in combination with the shifted-excitation-spot (SES) method. In selected samples we have observed a distinct difference in behaviour between VSL and SES curves, indicating the occurrence of positive optical gain of ~ 24 cm-1. Preliminary reports on transport and electroluminescence measurements in thin films of SiO2 doped with porous silicon grains, prepared by spin-coating technique, are also discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.99-100.31.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Heat Treatment on the Microstructure and Creep Behavior of Mg-Sn-Ca Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 69-72 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The development of new Mg-Sn based alloys that have shown improved corrosionresistance needs further investigations to develop standard alloys for industrial use. In the presentstudy, the influence of heat treatment was investigated by examining the creep resistance of Mg-Snand Mg-Sn-Ca alloys at 85 MPa under 135 °C identify the best conditions to improve the mechanicalproperties of such alloys. Additionally, the changes in microstructure of these alloys were studied andanalysed by light microscopy, X-ray diffraction and scanning electron microscopy. It was found thatthe heat treatments can affect the microstructure of the binary alloy while no apparent change in themicrostructure was found in the Mg-Sn-Ca alloys, indicating that the second phase CaMgSn isthermal stable in this alloy. Based on the obtained results, the relationship between the microstructureand creep behaviour are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.69.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Nickel Purity on Self-Diffusion along High-Diffusivity Paths (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 245-248 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the temperature range 600–1000 ºC, the effect of material purity on self-diffusionalong grain boundaries has been studied in both the pure (Puratronic 99.9945%) and the technical(99.5%) nickel. The penetration profiles were measured by the serial sectioning method using the63Ni radiotracer. The extensive electron backscatter diffraction (EBSD) analysis was performed onthe same samples in order to reveal possible differences in microstructure induced by the impuritycontent. The obtained microstructure characteristics were further interpreted in terms of thecoincidence site lattice (CSL) model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.245.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Ordering on the Elastic Parameters of Multicomponent Ni-Based Systems (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 482 (Apr. 2005), p. 147-150 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ordering in Ni-based superalloys is the crucial process controlling the development of the characteristic two-phase microstructure and subsequently the mechanical properties. Disordered systems containing up to six alloying elements typical of advanced Ni-based superalloys were modelled in this work. Their ordering at elevated temperatures was simulated using a Monte Carlo approach with phenomenological Lennard-Jones pair potentials. Selected atomic configurationsdiffering in the degree of order were subject to further studies of elastic parameters. Hydrostatic deformation and uniaxial deformation along high symmetry directions of model crystals were simulated. Molecular dynamics was used to relax local atomic positions in deformed crystals. Changes of elastic parameters due to ordering in face centred cubic lattice are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.482.147.pdf
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    Paper (German National Licenses)
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