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@ARTICLE{Rheinheimer:887840,
      author       = {Rheinheimer, Wolfgang and Hoffmann, Michael J.},
      title        = {{G}rain growth transitions of perovskite ceramics and their
                      relationship to abnormal grain growth and bimodal
                      microstructures},
      journal      = {Journal of materials science},
      volume       = {51},
      number       = {4},
      issn         = {1573-4803},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {FZJ-2020-04466},
      pages        = {1756 - 1765},
      year         = {2016},
      abstract     = {Barium titanate, strontium titanate, and lithium lanthanum
                      titanate (LLTO) were used to study grain growth in
                      perovskite ceramics. In these materials, a grain growth
                      transition was found. In the case of barium titanate, grain
                      growth shows a gradual transition to faster growth with
                      increasing temperature, whereas strontium titanate indicates
                      exponentially decreasing grain growth with increasing
                      temperature. In reducing atmosphere, strontium titanate
                      shows two transitions; the additional second transition is
                      attributed to a reversible wetting transition. In LLTO, a
                      single grain growth transition was found and seems to be
                      caused by a wetting transition as well. In all cases, the
                      grain growth transitions are strongly correlated to abnormal
                      grain growth. This non-Arrhenius behavior of grain growth in
                      perovskites is discussed in relation to abnormal grain
                      growth and bimodal microstructures: the existence and
                      coexistence of two grain boundary types with different grain
                      boundary mobility is proposed. In this framework, a gradual
                      transition of the boundary population from type 1 to type 2
                      with temperature seems to cause the growth phenomena in
                      perovskites on a macroscopic scale. Most likely, this
                      gradual transition is driven by the anisotropy of the grain
                      boundary energy. Possible microscopic origins of the grain
                      growth transitions are discussed. The consequences of
                      bimodal growth and boundary anisotropy for classical mean
                      field modeling of grain growth are assessed: the grain
                      growth constant k is not capable to appropriately reflect
                      grain growth in perovskites, and boundary anisotropy cannot
                      be included in standard mean field approaches.},
      cin          = {IEK-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000367647100009},
      doi          = {10.1007/s10853-015-9535-6},
      url          = {https://juser.fz-juelich.de/record/887840},
}