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@ARTICLE{Meyer:31698,
      author       = {Meyer, R. and Waser, R. and Helmboldt, J. and Borchardt,
                      G.},
      title        = {{C}ationic surface segregation in donor-doped {S}r{T}i{O}3
                      under oxidizing conditions},
      journal      = {Journal of electroceramics},
      volume       = {9},
      issn         = {1385-3449},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-31698},
      pages        = {101 - 110},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The influence of high temperature oxygen annealing on (100)
                      oriented donor-doped SrTiO3 single crystals was studied.
                      Crystalline precipitates were found on the optical scale on
                      surfaces of lanthanum-doped as well as niobium-doped
                      specimens with donor concentrations above 0.5 $at.\%.$ The
                      amount of the secondary phase increases with the doping
                      level, oxidation temperature and oxidation time. EDX
                      analyses of the crystallites reveal a SrOx composition.The
                      formation of the observed secondary phase is discussed by
                      means of the defect re-equilibration of the cation
                      sub-lattice. In view of the point defect model for
                      donor-doped perovskites, n-conducting SrTiO3 changes its
                      compensation mechanism during an oxidation treatment from
                      "electronic compensation" (N-D = n) to "self-compensation"
                      (N-D = 2[V-Sr"]) by forming cation vacancies. Due to the
                      favored Schottky-type disorder in perovskites, the formation
                      of strontium vacancies is accompanied by a release of
                      strontium from the regular lattice. Since the excess
                      strontium is found to be situated at the surface in form of
                      SrO-rich precipitates only, we propose the formation of
                      strontium vacancies via a surface defect reaction and the
                      chemical diffusion of strontium vacancies from the surface
                      into the crystal as the most probable re-equilibration
                      mechanism for the oxidation treatment of single crystals.The
                      introduced mechanism is in contrast to an established model
                      which proposes the formation of Ruddlesden-Popper
                      intergrowth phases SrO.(SrTiO3)(n) in the interior of the
                      crystal.},
      keywords     = {J (WoSType)},
      cin          = {IFF-EKM},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB35},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Materials Science, Ceramics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000180947500002},
      url          = {https://juser.fz-juelich.de/record/31698},
}