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  • Artikel  (4)
  • Surface physics, nanoscale physics, low-dimensional systems  (2)
  • 82.80  (1)
  • Chemical Engineering  (1)
  • 1
    ISSN: 1432-0630
    Schlagwort(e): 73.40 ; 82.80 ; 85.30
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract An ultra-thin AuGeNi alloy (84%/12%/4% by weight) overlayer of 5 nm was evaporated onto Te-doped n-type (100) oriented GaSb substrates. Samples were annealed in ultra-high vacuum (UHV), with a base pressure of 10−10 Torr at either 300°C, 500°C, or 700°C for 12 h. The reacted interface was then revealed by Ar ion sputter-depth profiling. The highest percentage of Ge in the deep interface region was observed for the sample annealed at 500°C. Annealing at 500°C also leads to a uniform distribution of Ga, Sb, and Au concentrations. Results show that virtually all Au, Ge, and Ni evaporate away after annealing at 700°C. Au-based AuGa alloy formation was indicated by the shifts of Au 4f core-levels and the metallic Ga 3d peak. The small variation of Au 4f core-levels with sputtering for samples annealed at 500°C is the evidence of AuGa uniform alloying from the surface to the interface. It has been, therefore, concluded that annealing at 500°C forms a more uniform distribution of cluster size throughout the interface than annealing at 300°C or 700°C.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Process Safety Progress 17 (1998), S. 259-262 
    ISSN: 1066-8527
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Case histories of 65 incidents in runaway reactions and emergency relief in Taiwan were analyzed and classified into several categories according to their causes, materials involved, equipment types, reaction types, and ignition sources. The cases in reactors and storage tanks were examined in more detail owing to the higher probability or larger potential hazard in these two types of equipments. The most common consequence of the incidents are explosions, fires, and atmospheric release of toxic chemicals. The most severe case was a thermal explosion from an organic peroxide storage area which caused the death of 33 persons. Popping and direct releasing of process chemicals to the atmosphere from relieving devices cause the greatest environmental concerns to the community close to the plants. Runaway reactions in batch type reactors occur frequently due to various operational mistakes. Heat of reaction is the most frequent ignition source of runaway reactions and emergency relief.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2016-07-30
    Beschreibung: Author(s): Xi Chen, J. R. Wallbank, M. Mucha-Kruczyński, E. McCann, and V. I. Fal'ko We investigate the magnetic minibands of a heterostructure consisting of bilayer graphene (BLG) and hexagonal boron nitride (hBN) by numerically diagonalizing a two-band Hamiltonian that describes electrons in BLG in the presence of a moiré potential. Due to inversion-symmetry breaking characteristi… [Phys. Rev. B 94, 045442] Published Fri Jul 29, 2016
    Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2014-02-06
    Beschreibung: Author(s): Xi Chen, J. R. Wallbank, A. A. Patel, M. Mucha-Kruczyński, E. McCann, and V. I. Fal'ko We find a systematic reappearance of massive Dirac features at the edges of consecutive minibands formed at magnetic fields Bp/q=pqϕ0/S providing rational magnetic flux through a unit cell of the moiré superlattice created by a hexagonal substrate for electrons in graphene. The Dirac-type features i... [Phys. Rev. B 89, 075401] Published Wed Feb 05, 2014
    Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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