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@ARTICLE{Rodenbcher:903836,
      author       = {Rodenbücher, Christian and Guguschev, Christo and Korte,
                      Carsten and Bette, Sebastian and Szot, Kristof},
      title        = {{I}s {R}educed {S}trontium {T}itanate a {S}emiconductor or
                      a {M}etal?},
      journal      = {Crystals},
      volume       = {11},
      number       = {7},
      issn         = {2073-4352},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2021-05469},
      pages        = {744 -},
      year         = {2021},
      abstract     = {In recent decades, the behavior of SrTiO3 upon annealing in
                      reducing conditions has been under intense academic
                      scrutiny. Classically, its conductivity can be described
                      using point defect chemistry and predicting n-type or p-type
                      semiconducting behavior depending on oxygen activity. In
                      contrast, many examples of metallic behavior induced by
                      thermal reduction have recently appeared in the literature,
                      challenging this established understanding. In this study,
                      we aim to resolve this contradiction by demonstrating that
                      an initially insulating, as-received SrTiO3 single crystal
                      can indeed be reduced to a metallic state, and is even
                      stable against room temperature reoxidation. However, once
                      the sample has been oxidized at a high temperature,
                      subsequent reduction can no longer be used to induce
                      metallic behavior, but semiconducting behavior in agreement
                      with the predictions of point defect chemistry is observed.
                      Our results indicate that the dislocation-rich surface layer
                      plays a decisive role and that its local chemical
                      composition can be changed depending on annealing
                      conditions. This reveals that the prediction of the
                      macroscopic electronic properties of SrTiO3 is a highly
                      complex task, and not only the current temperature and
                      oxygen activity but also the redox history play an important
                      role},
      cin          = {IEK-14},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000676215500001},
      doi          = {10.3390/cryst11070744},
      url          = {https://juser.fz-juelich.de/record/903836},
}