% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Rettenwander:850868,
      author       = {Rettenwander, Daniel and Redhammer, Günther J. and Guin,
                      Marie and Benisek, Artur and Krüger, Hannes and Guillon,
                      Olivier and Wilkening, Martin and Tietz, Frank and Fleig,
                      Jürgen},
      title        = {{A}rrhenius {B}ehavior of the {B}ulk {N}a-{I}on
                      {C}onductivity in {N}a 3 {S}c 2 ({PO} 4 ) 3 {S}ingle
                      {C}rystals {O}bserved by {M}icrocontact {I}mpedance
                      {S}pectroscopy},
      journal      = {Chemistry of materials},
      volume       = {30},
      number       = {5},
      issn         = {1520-5002},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2018-04619},
      pages        = {1776 - 1781},
      year         = {2018},
      abstract     = {NASICON-based solid electrolytes with exceptionally high
                      Na-ion conductivities are considered to enable future all
                      solid-state Na-ion battery technologies. Despite 40 years of
                      research the interrelation between crystal structure and
                      Na-ion conduction is still controversially discussed and far
                      from being fully understood. In this study, microcontact
                      impedance spectroscopy combined with single crystal X-ray
                      diffraction, and differential scanning calorimetry is
                      applied to tackle the question how bulk Na-ion conductivity
                      σbulk of sub-mm-sized flux grown Na3Sc2(PO4)3 (NSP) single
                      crystals is influenced by supposed phase changes (α, β,
                      and γ phase) discussed in literature. Although we found a
                      smooth structural change at around 140 °C, which we assign
                      to the β → γ phase transition, our conductivity data
                      follow a single Arrhenius law from room temperature (RT) up
                      to 220 °C. Obviously, the structural change, being mainly
                      related to decreasing Na-ion ordering with increasing
                      temperature, does not cause any jumps in Na-ion conductivity
                      or any discontinuities in activation energies Ea. Bulk ion
                      dynamics in NSP have so far rarely been documented; here,
                      under ambient conditions, σbulk turned out to be as high as
                      3 × 10–4 S cm–1 at RT (Ea, bulk = 0.39 eV) when
                      directly measured with microcontacts for individual small
                      single crystals.},
      cin          = {IEK-1 / IEK-12},
      ddc          = {540},
      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},
      pubmed       = {pmid:29606799},
      UT           = {WOS:000427661500038},
      doi          = {10.1021/acs.chemmater.8b00179},
      url          = {https://juser.fz-juelich.de/record/850868},
}