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@ARTICLE{Pithan:53290,
      author       = {Pithan, C. and Shiratori, Y. and Magrez, A. and Mi, S.-B.
                      and Dornseiffer, J. and Waser, R.},
      title        = {{C}onsolidation microstructure and crystallography of dense
                      {N}a{N}b{O}3 ceramics with ultrafine grainz size},
      journal      = {Journal of the Ceramic Society of Japan},
      volume       = {114},
      issn         = {0914-5400},
      address      = {Tokyo},
      publisher    = {Soc.},
      reportid     = {PreJuSER-53290},
      pages        = {995 - 1000},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The present study reports on the preparation and structural
                      characterization of dense NaNbO3 ceramics with ultrafine
                      grain size. Nanocrystalline raw powders obtained via
                      microemulsion mediated synthesis were consolidated to green
                      compacts, sinterforged to ceramic pellets with high density
                      and ultra-fine microstructure and finally annealed under
                      different thermal regimes in order to systematically
                      increase the average grain size in the range from several
                      hundreds of urn up to a few mu m. Structural
                      characterization of these materials included
                      electron-microscopic observation and X-ray diffraction in
                      combination with temperature tuning Raman-spectroscopy in
                      order to detect both the global and local crystallographic
                      symmetry in dependence of the grain size. The results show
                      that ceramics with an average grain size from approximately
                      360 urn to 1-2 mu m consist of a phase mixture of the
                      anti-ferroelectric phase with the space group Pbcm, which is
                      also observed for the conventional case of coarse NaNbO3,
                      and secondly of a new polar polymorph described by the space
                      group Pmc2(1). The volume fraction of the second polar
                      modification appears to increase with decreasing grain size
                      suggesting an enhancement of the piezoelectric response of
                      ultra-fine grained NaNbO3 ceramics in comparison to coarse
                      grained material of the same composition.},
      keywords     = {J (WoSType)},
      cin          = {IFF-IEM / ICG-II},
      ddc          = {660},
      cid          = {I:(DE-Juel1)VDB321 / I:(DE-Juel1)VDB48},
      pnm          = {Kondensierte Materie / Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK414 / G:(DE-Juel1)FUEK406},
      shelfmark    = {Materials Science, Ceramics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000242273100022},
      doi          = {10.2109/jcersj.114.995},
      url          = {https://juser.fz-juelich.de/record/53290},
}