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@ARTICLE{Metlenko:171756,
      author       = {Metlenko, Veronika and Ramadan, Amr H. H. and Gunkel, Felix
                      and Du, Hongchu and Schraknepper, Henning and
                      Hoffmann-Eifert, Susanne and Dittmann, Regina and Waser,
                      Rainer and De Souza, Roger A.},
      title        = {{D}o dislocations act as atomic autobahns for oxygen in the
                      perovskite oxide {S}r{T}i{O}$_{3}$?},
      journal      = {Nanoscale},
      volume       = {6},
      number       = {21},
      issn         = {2040-3372},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2014-05322},
      pages        = {12864 - 12876},
      year         = {2014},
      abstract     = {The transport properties of edge dislocations comprising a
                      symmetrical 6° [001] tilt grain boundary in weakly
                      acceptor-doped SrTiO3 were investigated by means of various
                      experimental and computational techniques. Oxygen transport
                      along the dislocation array was probed by means of 18O/16O
                      exchange experiments under (standard) oxidising conditions
                      (pO2 = 5 × 10−1 bar) and also under reducing conditions
                      (pO2 = 7 × 10−22 bar) at T = 973 K. In both cases,
                      isotope profiles obtained by Secondary Ion Mass Spectrometry
                      (SIMS) indicated no evidence of fast diffusion along the
                      dislocation array. Charge transport across the dislocation
                      array was probed in equilibrium electrical conductivity
                      measurements as a function of oxygen partial pressure,
                      10−23 ≤ pO2/bar ≤ 1 at temperatures of T/K = 950,
                      1050, 1100. A significant decrease in the conductivity of
                      the bicrystal (relative to that of a single crystal) was
                      observed under oxidising conditions, but not under reducing
                      conditions. These studies were complemented by static
                      lattice simulations employing empirical pair-potentials. The
                      simulations predict, that the tilt boundary comprises two
                      types of dislocation cores, that the formation of oxygen
                      vacancies is energetically preferred at both cores relative
                      to the bulk, and that the migration of oxygen ions along
                      both cores is hindered relative to the bulk. Combining all
                      results and literature reports, we present a comprehensive
                      and consistent picture of the transport properties of
                      dislocations in SrTiO3.},
      cin          = {PGI-7 / PGI-5 / JARA-FIT},
      ddc          = {600},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / I:(DE-Juel1)PGI-5-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344997500080},
      pubmed       = {pmid:25263456},
      doi          = {10.1039/C4NR04083J},
      url          = {https://juser.fz-juelich.de/record/171756},
}