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Träfflista för sökning "WFRF:(Wallenberg L. Reine) srt2:(1990-1994)"

Sökning: WFRF:(Wallenberg L. Reine) > (1990-1994)

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1.
  • Birch, J., et al. (författare)
  • Growth and structural characterization of single-crystal (001) oriented Mo V superlattices
  • 1990
  • Ingår i: Vacuum. - 0042-207X. ; 41:4-6, s. 1231-1233
  • Tidskriftsartikel (refereegranskat)abstract
    • Dual target magnetron sputtering has been used to grow single-crysal MoV superlattice structures (SLS) with modulation wavelengths λ ranging from 0.6 to 17.7 nm on (001) oriented MgO substrates held at temperatures Ts between 600 and 900°C. High resolution cross-sectional transmission electron microscopy (HRXTEM) images and comparisions between experimental and calculated X-ray diffraction (XRD) spectra show that SLS with an interface sharpness of ±1 monolayer (±0.15 nm) could be grown for λ ⩽ 4.9 nm and Ts ⩽ 700°C whereas interdiffusion broadened the interfaces for higher Ts values. This interface sharpness was also verified by growing SLS with λ = 0.6 nm (one unit cell of Mo and one of V) which exhibited strong superlattice satellites in both XRD and selected area electron diffraction (SAED), and contrast from the individual layers was also observed in HRXTEM images. For λ > 4.9 nm, HRXTEM images showed non-uniform layers and the XRD peak width (FWHM) increased by 250%.
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2.
  • Sanati, Mehri, et al. (författare)
  • A Study of Spreading of Vanadia on Titania Polymorphs Using Mechanical Mixtures
  • 1993
  • Ingår i: New Frontiers in Catalysis (Studies in Surface Science and Catalysis ). - 0167-2991. ; 75, s. 1755-1758
  • Konferensbidrag (refereegranskat)abstract
    • Mechanical mixtures of V2O5 and each of the three titania polymorphs TiO2(B), anatase and rutile were heated in air at 450°C. Spreading of vanadia was found to occur on all three polymorphs. After 36 hours of heating, coverage with interacting vanadia (the part that is insoluble in aq. NH3) on TiO2(B), anatase and rutile, respectively, was 54, 48 and 38 % of a theoretical monolayer. Raman spectra confirmed spreading and interaction. HREM images revealed no formation of multilayers of vanadia on titania. Use of the monolayer catalysts for toluene ammoxidation indicated their activity for benzonitrile formation to vary with respect to support in the order TiO2(B) > anatase > rutile.
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  • Resultat 1-2 av 2
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konferensbidrag (1)
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refereegranskat (2)
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Birch, J. (1)
Yamamoto, Y. (1)
Wallenberg, Reine (1)
Hultman, L (1)
Sanati, Mehri (1)
Andersson, Arne (1)
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Guczi et al, L (1)
Radnoczi, G. (1)
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