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@ARTICLE{Shiratori:55901,
      author       = {Shiratori, Y. and Magrez, A. and Dornseiffer, J. and
                      Haegel, F.-H. and Pithan, C. and Waser, R.},
      title        = {{P}olymorphism in micro-, submicro-, and nanocrystalline
                      {N}a{N}b{O}3},
      journal      = {The journal of physical chemistry / B},
      volume       = {109},
      issn         = {1520-6106},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PreJuSER-55901},
      pages        = {20122 - 20130},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {NaNbO(3) powders with various particle sizes (ranging from
                      30 nm to several microns) and well-controlled stoichiometry
                      were obtained through microemulsion-mediated synthesis. The
                      effect of particle size on the phase transformation of the
                      prepared NaNbO(3) powders was studied using X-ray powder
                      diffraction, Raman spectroscopy, and nuclear site group
                      analysis based on these spectroscopic data. Coarsened
                      particles exhibit an orthorhombic Pbcm (D(2h)(11), no. 57)
                      structure corresponding to the bulk structure, as observed
                      for single crystals or powders prepared by conventional
                      solid-state reaction. The crystal symmetry of submicron
                      powders was refined with the space group Pmc2(1) (C(2v)(2),
                      no. 26). The reduced perovskite cell volumes of these
                      submicron powders were most expanded compared to all the
                      other structures. Fine particles with a diameter of less
                      than 70 nm as measured from SEM observations showed an
                      orthorhombic Pmma (D(2h)(5), no. 51) crystal symmetry. The
                      perovskite formula cell of this structure was pseudocubic
                      and was the most compact one. A possible mechanism of the
                      phase transformation is suggested.},
      cin          = {IFF-IEM / ICG-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB321 / I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:16853601},
      UT           = {WOS:000232959800012},
      doi          = {10.1021/jp052974p},
      url          = {https://juser.fz-juelich.de/record/55901},
}