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@ARTICLE{Emelyanov:25928,
      author       = {Emelyanov, A. Y. and Pertsev, S. and Hoffmann-Eifert, S.
                      and Boettger, U. and Waser, R.},
      title        = {{G}rain-boundary effect on the {C}urie-{W}eiss law of
                      ferroelectric ceramics and polycrystalline thin films :
                      calculation by the method of effective medium},
      journal      = {Journal of electroceramics},
      volume       = {9},
      issn         = {1385-3449},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-25928},
      pages        = {5 - 16},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The influence of grain boundaries on the dielectric
                      properties of ferroelectric ceramics and polycrystalline
                      thin films is described theoretically by the method of
                      effective medium. Grain boundaries are modeled by
                      low-permittivity ("dead") layers, which do not exhibit
                      ferroelectric instability. The effective permittivity of a
                      polycrystalline material is calculated in the paraelectric
                      regime above the transition temperature. The calculations
                      are based on the solution of electrostatic problem for a
                      spherical dielectric inclusion separated from the
                      surrounding dissimilar matrix by a low-permittivity
                      interface layer. For isotropic bulk ceramics, an analytic
                      expression is derived for the effective permittivity as a
                      function of the grain size, dead-layer thickness, and its
                      permittivity. Temperature dependence of the aggregate
                      dielectric response is calculated for BaTiO3 (BT) ceramics
                      of different grain sizes and found to be in good agreement
                      with measurements. It is shown that grain boundaries not
                      only renormalize the Curie-Weiss temperature and constant,
                      but may also cause deviations from the Curie-Weiss law. For
                      BT polycrystalline thin films grown on dissimilar
                      substrates, numerical calculations of the effective
                      dielectric constants are performed, taking into account both
                      the grain-boundary and substrate effects on the film
                      anisotropic dielectric response. Theoretical predictions are
                      compared with the grain size dependence of the permittivity
                      of BT films grown on Pt-coated Si.},
      keywords     = {J (WoSType)},
      cin          = {IFF-EKM},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB35},
      pnm          = {Materialien, Prozesse und Bauelemente für die Mikro- und
                      Nanoelektronik},
      pid          = {G:(DE-Juel1)FUEK252},
      shelfmark    = {Materials Science, Ceramics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000179916000001},
      doi          = {10.1023/A:1021665300233},
      url          = {https://juser.fz-juelich.de/record/25928},
}