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Träfflista för sökning "L773:0030 4948 OR L773:1945 5453 "

Search: L773:0030 4948 OR L773:1945 5453

  • Result 1-6 of 6
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  • Engqvist, Robert, et al. (author)
  • An improved synthesis of neocryptolepine
  • 2004
  • In: Organic preparations and procedures international. - : Informa UK Limited. - 0030-4948 .- 1945-5453. ; 36:4, s. 386-390
  • Journal article (peer-reviewed)
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  • El Hachmi, Abdelhadi, et al. (author)
  • Synthesis and Rietveld refinements of new ceramics Sr2CaFe2WO9 and Sr2PbFe2TeO9 perovskites
  • 2018
  • In: Powder Diffraction. - : J C P D S-INT CENTRE DIFFRACTION DATA. - 0885-7156 .- 1945-7413. ; 33:2, s. 134-140
  • Journal article (peer-reviewed)abstract
    • Ceramics of Sr2CaFe2WO9 and Sr2PbFe2TeO9 double perovskites have been prepared in polycrystalline form by solid-state technique, in the air. The crystalline structure was analyzed using X-ray powder diffraction (XRPD) at room temperature. Rietveld analysis of XRPD) patterns show that both compounds adopt a tetragonal structure with space group I4/m, with unit cell parameters a = 5.5453(1) angstrom, c = 7.8389(1) angstrom for Sr(2)CaFc(2)WO(9), and a = 5.5994(15) angstrom, c = 7.8979(30) angstrom for Sr2PbFe2TeO9. A certain degree of anti-site disordering of W and/or Te and Fe on the B -sites have been detected, indicating the presence of a partial amount of W and/or Te at Fe positions and vice versa.
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  • Result 1-6 of 6

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