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Träfflista för sökning "WFRF:(Ishchenko A. V.) "

Search: WFRF:(Ishchenko A. V.)

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1.
  • Zubkov, V. G., et al. (author)
  • Structural, vibrational, electronic, and luminescence properties of the cyclotetravanadates A(2)M(VO3)(4) (A=Na,Ag; M=Ca,Sr)
  • 2008
  • In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 77, s. 174113-
  • Journal article (peer-reviewed)abstract
    • The physical properties of the family of cyclotetravanadates A(2)M(VO3)(4), where A=Na,Ag and M=Ca,Sr, have been studied by means of x-ray powder diffraction, neutron diffraction, electron diffraction, infrared, Raman, NMR, photoexcitation and pulse cathode beam excitation, and x-ray photoelectron spectroscopies, and band structure calculations. The differences between the structural, vibrational, luminescence, and electronic properties of the alkali metal-containing [Na2Ca(VO3)(4) and Na2Sr(VO3)(4)] and the d metal-containing cyclotetravanadates [Ag2Ca(VO3)(4) and Ag2Sr(VO3)(4)] are analyzed. Na2Ca(VO3)(4), Ag2Ca(VO3)(4), Na2Sr(VO3)(4), and Ag2Sr(VO3)(4) have tetragonal structures, P4/nbm, with a=10.438 49(6), 10.445 24(5), 10.634 49(4), and 10.625 74(6), and c=4.938 73(5), 4.968 45(5), 4.962 05(4), and 4.979 30(4) angstrom, respectively. The main structural feature of A(2)M(VO3)(4) is the tetracyclic [V4O12] units. The hybridized O 2p-V 3d states of the tetracyclic [V4O12] units have a dominant influence on the electronic structure of these compounds. The compounds are semiconducting with a local density approximation band gap increasing, from 1.85 eV for Ag2Ca(VO3)(4) to 3.02 eV for Na2Ca(VO3)(4). The prospects of these compounds as advanced materials for detectors of photon and corpuscular radiation as well as for color correction of light emission sources such as lamp and light emitting diode sources are discussed.
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2.
  • Lesnyak, V V, et al. (author)
  • The kinetic patterns of CO oxidation on WO3 promoted with pt or pd
  • 2007
  • In: Russian Journal of Physical Chemistry. - 0036-0244 .- 1531-863X. ; 81:6, s. 874-877
  • Journal article (peer-reviewed)abstract
    • The kinetic peculiarities of CO oxidation on WO3 promoted with Pt or Pd were studied. In the region of low catalyst activity (the degree of CO conversion below 20%), the reaction was found to be zero-order in CO and first-order in oxygen. In the high-activity region (CO conversion above 95%), the reaction order was first with respect to CO and zeroth with respect to oxygen. Hysteresis phenomena were observed for the r - c (O-2) and r - c (CO) dependences at certain temperatures. A reaction scheme combining the heterogeneous and heterogeneous-homogeneous mechanisms was suggested.
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