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@ARTICLE{Shiratori:58115,
      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 {II} - consolidated polycrystalline ceramics},
      journal      = {Journal of Raman spectroscopy},
      volume       = {38},
      issn         = {0377-0486},
      address      = {Chichester [u.a.]},
      publisher    = {Wiley},
      reportid     = {PreJuSER-58115},
      pages        = {1300 - 1306},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {BaTiO3 dense ceramics with different grain sizes from 5.6
                      gm down to 35 nrn were thoroughly studied by Raman
                      spectroscopy. The temperature characteristics of optical
                      phonons were compared with those obtained for powders. The
                      micrograined ceramic revealed the well-known spectrum
                      profiles and transitions, typical for bulk BaTiO3. On the
                      other hand, the Raman spectra obtained for a nanograined
                      ceramic with an average grain size of 35 nm revealed a
                      tetragonally distorted pure BaTiO3 phase showing a diffused
                      phase transition behaviour with respect to temperature.
                      Abnormality of phonon damping characteristics for the
                      nanograined ceramic was demonstrated through comparison with
                      powders with various crystallite sizes and the micrograined
                      ceramic. The Curie temperature of the nartograined ceramic
                      was estimated to be 105 degrees C from the temperature
                      characteristic of a sharp peak at 307 cm(-1), which is one
                      of the most specific tetragonal features for bulk BaTiO3. In
                      the present study, local stabilization of the tetragonal
                      phase in ultra-fine grains was experimentally demonstrated
                      from comparison between the Raman spectroscopic results for
                      powders and ceramics prepared through microemulsion-mediated
                      synthesis. Rather long phonon mean free paths can exist even
                      in such ultra-fine grains, but the phonon characteristics
                      originating from various grains are diffused mainly because
                      of the effect of internal stress. Copyright (c) 2007 John
                      Wiley $\&$ Sons, Ltd.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2 / IFF-6 / JARA-FIT},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB791 / I:(DE-Juel1)VDB786 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Spectroscopy},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000250239400009},
      doi          = {10.1002/jrs.1763},
      url          = {https://juser.fz-juelich.de/record/58115},
}