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@ARTICLE{Naqash:850867,
      author       = {Naqash, Sahir and Tietz, Frank and Guillon, Olivier},
      title        = {{S}ynthesis and characterization of equimolar
                      {A}l/{Y}-substituted {NASICON} solid solution
                      {N}a1+2x+y{A}lx{Y}x{Z}r2−2x{S}iy{P}3−y{O}12},
      journal      = {Solid state ionics},
      volume       = {319},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-04618},
      pages        = {13 - 21},
      year         = {2018},
      abstract     = {An equimolar substitution of Zr4+ with Al3+ and Y3+ was
                      chosen to prepare two NASICON series,
                      Na1+2xAlxYxZr2−2x(PO4)3 and
                      Na3+2xAlxYxZr2−2x(SiO4)2(PO4)3, which were compared with
                      previously investigated Sc3+-substituted NASICON materials.
                      The common feature of all series is a mean effective ionic
                      radius of the transition metal cations of
                      0.718 Å < reff < 0.745 Å.
                      Na1+2xAlxYxZr2−2x(PO4)3 (0 ≤ x ≤ 0.3) has a
                      rhombohedral crystal structure, whereas
                      Na3+2xAlxYxZr2−2x(SiO4)2(PO4)3 changes the modification
                      from a monoclinic (0 ≤ x ≤ 0.1) to a
                      rhombohedral structure (x > 0.1). The average linear
                      coefficient of thermal expansion of
                      Na3+2xAlxYxZr2−2x(SiO4)2(PO4)3, obtained from high
                      temperature X-ray diffraction, increased when x was raised
                      from 4.1 · 10−6 K−1 to 8.1 · 10−6 K−1.
                      The ionic conductivity of Na1+2xAlxYxZr2−2x(PO4)3
                      compositions was one to two orders of magnitude lower than
                      the Na3+2xAlxYxZr2−2x(SiO4)2(PO4)3 series. For the latter
                      series, conductivity decreased when the Al/Y substitution
                      was increased, despite the number of charge carriers (Na+)
                      increasing. Conductivity was 0.8 mS cm−1 when
                      x = 0, and 0.08 mS cm−1 when x = 0.3. This
                      demonstrates that the transport properties in NASICON
                      materials are not only affected by the steric interactions
                      (i.e. reff, mean width of conduction path) but also the
                      electrostatic interactions (charge, bond strength, atomic
                      orbitals) of the substituting cations.},
      cin          = {IEK-1 / IEK-12},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-12-20141217},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000432505300003},
      doi          = {10.1016/j.ssi.2018.01.048},
      url          = {https://juser.fz-juelich.de/record/850867},
}