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@ARTICLE{Heidelmann:154603,
      author       = {Heidelmann, Markus and Barthel, Juri and Cox, Gerhard and
                      Weirich, Thomas},
      title        = {{P}eriodic {C}ation {S}egregation in
                      {C}s$_{0.44}$[{N}b$_{2.54}${W}$_{2.46}${O}$_{14}$]
                      {Q}uantified by {H}igh-{R}esolution {S}canning
                      {T}ransmission {E}lectron {M}icroscopy},
      journal      = {Microscopy and microanalysis},
      volume       = {20},
      number       = {5},
      issn         = {1431-9276},
      address      = {New York, NY},
      publisher    = {Cambridge University Press},
      reportid     = {FZJ-2014-03896},
      pages        = {1453-1462},
      year         = {2014},
      abstract     = {The atomic structure of Cs0.44[Nb2.54W2.46O14] closely
                      resembles the structure of the most active catalyst for the
                      synthesis of acrylic acid, the M1 phase of . Consistently
                      with observations made for the latter compound, the
                      high-angle electron scattering signal recorded by scanning
                      transmission electron microscopy shows a significant
                      intensity variation, which repeats periodically with the
                      projected crystallographic unit cell. The occupation factors
                      for the individual mixed Nb/W atomic columns are extracted
                      from the observed intensity variations. For this purpose,
                      experimental images and simulated images are compared on an
                      identical intensity scale, which enables a quantification of
                      the cation distribution. According to our analysis specific
                      sites possess low tungsten concentrations of $25\%,$ whereas
                      other sites have tungsten concentrations above $70\%.$ These
                      findings allow us to refine the existing structure model of
                      the target compound, which has until now described a uniform
                      distribution of the niobium and tungsten atoms in the unit
                      cell, showing that the similarity between
                      Cs0.44[Nb2.54W2.46O14] and the related catalytic compounds
                      also extends to the level of the cation segregation.},
      cin          = {PGI-5},
      ddc          = {570},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000345742900014},
      doi          = {10.1017/S1431927614001330},
      url          = {https://juser.fz-juelich.de/record/154603},
}