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@ARTICLE{Acker:201051,
      author       = {Acker, Jérôme and Kungl, Hans and Hoffmann, Michael J.},
      title        = {{S}intering and microstructure of potassium niobate
                      ceramics with stoichiometric composition and with potassium-
                      or niobium excess},
      journal      = {Journal of the European Ceramic Society},
      volume       = {33},
      number       = {11},
      issn         = {0955-2219},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2015-03361},
      pages        = {2127 - 2139},
      year         = {2013},
      abstract     = {Stoichiometric potassium niobate (KNbO3) and materials with
                      K- and Nb excess show marked differences in sintering
                      behaviour and microstructure. Shrinkage is shifted to lower
                      temperatures in material with K-excess and to higher
                      temperatures in material with Nb-excess compared to the
                      stoichiometric KNbO3. The stoichiometric material densified
                      to 4.36 g/cm3, whereas the densities of the
                      off-stoichiometric materials remained lower. Abnormal grain
                      growth leading to grains up to 500 μm in size was observed
                      for stoichiometric KNbO3. K-excess KNbO3 shows cuboid grain
                      shape with size between 20 and 60 μm. In the Nb-excess
                      KNbO3 the grains remain small. Approaches to improve the
                      densification of the KNbO3 materials are discussed by
                      investigating processing variations specific for each
                      composition. The objective of our work is to analyze the
                      interrelations between stoichiometry, materials
                      characteristics and processing stability of alkaline niobate
                      ceramics. The results on KNbO3 mark a starting point for
                      investigations on complex high performance systems.},
      cin          = {IEK-9},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000319539500009},
      doi          = {10.1016/j.jeurceramsoc.2013.03.011},
      url          = {https://juser.fz-juelich.de/record/201051},
}