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Träfflista för sökning "WFRF:(Li LR) srt2:(1997-1999)"

Sökning: WFRF:(Li LR) > (1997-1999)

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1.
  • Carlsson, JRA, et al. (författare)
  • A new silicon phosphide, Si12P5 : Formation conditions, structure, and properties
  • 1997
  • Ingår i: Journal of Vacuum Science and Technology A. - : American Vacuum Society. - 0734-2101. ; 15:2, s. 394-401
  • Tidskriftsartikel (refereegranskat)abstract
    • The formation conditions, structure, and properties of the recently discovered phosphide, Si12P5 (initially assigned Si7P3), have been studied using x-ray diffraction, high-resolution transmission electron microscopy, photospectrometry, and a four-point probe. The phosphide formed in amorphous Si-P alloy thin films with 30, 35 and 44 at. % P after annealing at 1000°C for 30 min. During annealing at 1100°C, the phosphide dissociated through P evaporation. The Si12P5 phase is proposed to have rhombohedral symmetry with a P31m space group and a C5W12 structure. The hexagonal lattice parameters measured were a = 6.16±0.05 Å and c = 13.17±0.01 Å. The optical band gap and the electrical resistivity of the phosphide were determined to be 1.55 eV and 5 mΩ cm, respectively. The Gibbs free energy diagram for the Si-P system was modified to include this new Si12P5 phase.
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2.
  • Li, XZ, et al. (författare)
  • HREM study and structure modeling of the η′ phase, the hardening precipitates in commercial Al-Zn-Mg alloys
  • 1999
  • Ingår i: Acta Materialia. - 1359-6454. ; 47:9, s. 2651-2659
  • Tidskriftsartikel (refereegranskat)abstract
    • The structure of the η′ phase, one of the most important age-hardening precipitates in commercial Al-Zn-Mg alloys, has been studied at the atomic level by means of high-resolution electron microscopy (HREM). A structural model of the η′ phase has been constructed on the basis of the structural characteristics in the observed images and the structure of the η-MgZn2 phase. Image simulation of this model shows a good agreement between calculated and experimental images. Comparison of this model with the early existing model on the basis of the X-ray diffraction is also given.
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Wallenberg, LR (2)
Li, XH (1)
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Hansen, V (1)
Li, XZ (1)
Johansson, MP (1)
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Carlsson, JRA (1)
Madsen, LD (1)
Hentzell, HTG (1)
Gjønnes, J (1)
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