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@ARTICLE{Shiratori:58114,
      author       = {Shiratori, Y. and Pithan, C. and Dornseiffer, J. and Waser,
                      R.},
      title        = {{R}aman scattering studies on nanocrystalline {B}a{T}i{O}3,
                      {P}art {I} - isolated particles and aggregates},
      journal      = {Journal of Raman spectroscopy},
      volume       = {38},
      issn         = {0377-0486},
      address      = {Chichester [u.a.]},
      publisher    = {Wiley},
      reportid     = {PreJuSER-58114},
      pages        = {1288 - 1299},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {BaTiO3 powders with various crystallite sizes, which were
                      prepared through microemulsion-mediated synthesis, were
                      thoroughly studied by Raman spectroscopy. Clear evidence for
                      the presence of the tetragonal phase was found for ultrafine
                      powders with an average crystallite size above 30 run. The
                      lifetime of phonons that are specifically assigned to the
                      tetragonal phase decreased with decreasing crystallite size
                      below a critical size of 100 mn. In particles as fine as 100
                      nm, the short mean free path of phonons, mainly due to
                      internal pressure, causes decoupling of the coupled A, (TO)
                      phonons and a diffuse phase transition behaviour (T-c = 115
                      degrees C). Coupled A(1)(TO) phonons, which give a spectral
                      dip at around 180 cm(-1) and a lesser extent of diffuseness,
                      were revealed for powders consisting of particles as large
                      as 0.17 gm (Tc = 123 degrees C). Further coarsening upon
                      annealing induced the formation of aggregates, resulting in
                      the shift of phase transition points to higher temperatures
                      for the rhombohedral to orthorhombic and the orthorhombic to
                      tetragonal transitions and to lower temperatures for the
                      tetragonal to cubic transition, respectively. Phase
                      stability in powders is discussed by considering possible
                      factors such as internal pressure in isolated particles and
                      internal stress in aggregates. Copyright (c) 2007 John Wiley
                      $\&$ Sons, Ltd.},
      keywords     = {J (WoSType)},
      cin          = {IFF-6 / ICG-2 / JARA-FIT},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB786 / I:(DE-Juel1)VDB791 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Spectroscopy},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000250239400008},
      doi          = {10.1002/jrs.1764},
      url          = {https://juser.fz-juelich.de/record/58114},
}