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@INPROCEEDINGS{Tietz:857924,
      author       = {Tietz, Frank},
      title        = {{F}ast, faster, fastest: {I}onic conduction in {N}a{SICON}
                      materials},
      reportid     = {FZJ-2018-06878},
      year         = {2018},
      abstract     = {Na+ Super-Ionic CONductors (NaSICON) consist of a 3D
                      framework of corner-shared ZrO6 octahedra and (Si,P)O4
                      tetrahedra, joined by inter¬connected channels providing a
                      Na+ conduction pathway between Na(1) and Na(2) positions.
                      The original composition Na3Zr2Si2PO12 can be modified
                      according to the generalized formula as Na1+2w+x-y+z M2+w
                      M3+x M5+y Zr2-w-x-y (SiO4)z (PO4)3-z. To anticipate a fast
                      conducting NaSICON material, the composition should follow
                      specific design parameters:1. The size of transition metal
                      cations (reff = 0.72 Å)2. The Na content (3 – 3.5 moles
                      Na/formula unit)3. The crystal structure (monoclinic
                      distortion affecting the structural bottleneck)So far three
                      series of NaSICON materials were designed to verify the
                      proposed design parameters: Na3+xScxZr2-xSi2PO12,
                      Na3+xSc2SixP3-xO12 and Na1+2xAlxYxZr2-2xSiyP3-yO12. For the
                      first two series the maximum conductivity was indeed
                      obtained for x = 0.4, with the highest Na+ ion conductivity
                      in polycrystalline NaSICON materials ever reported for
                      Na3.4Sc0.4Zr1.6Si2PO12 (4 mS cm-1).},
      month         = {Aug},
      date          = {2018-08-20},
      organization  = {8th International Symposium on
                       Functional Materials, Aachen (Germany),
                       20 Aug 2018 - 23 Aug 2018},
      subtyp        = {Invited},
      cin          = {IEK-12 / IEK-1},
      cid          = {I:(DE-Juel1)IEK-12-20141217 / I:(DE-Juel1)IEK-1-20101013},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/857924},
}