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@ARTICLE{Rettenwander:810766,
      author       = {Rettenwander, D. and Welzl, A. and Pristat, S. and Tietz,
                      F. and Taibl, S. and Redhammer, G. J. and Fleig, J.},
      title        = {{A} microcontact impedance study on {NASICON}-type {L}i
                      $_{1+x}$ {A}l $_{x}$ {T}i $_{2−x}$ ({PO} 4 ) 3 (0 ≤ x
                      ≤ 0.5) single crystals},
      journal      = {Journal of materials chemistry / A},
      volume       = {4},
      number       = {4},
      issn         = {2050-7496},
      address      = {London {[u.a.]},
      publisher    = {RSC},
      reportid     = {FZJ-2016-03355},
      pages        = {1506 - 1513},
      year         = {2016},
      abstract     = {We successfully demonstrated the applicability of
                      microcontact impedance spectroscopy (MC IS) on Li+
                      conducting solid electrolytes and measured the Li+ bulk
                      conductivity (σb) of LiTi2(PO4)3 (LTP) and
                      Li1+xAlxTi2−x(PO4)3 (LATP) single crystals independent of
                      microstructural effects (e.g., grain boundaries, pores, and
                      density). The crystals had a size of about 100 μm in each
                      direction and crystallized with NASICON-type structure (R[3
                      with combining macron]c). Finite element calculations were
                      performed to validate the impedance data analysis. A strong
                      increase in σb in the order of three magnitudes (3.16 ×
                      10−6 to 1.73 × 10−3 S cm−1) was found after
                      incorporating 0.1 mol Al3+ per formula unit into LTP.
                      Moreover, since the crystal structural changes are almost
                      linear in the LATP system up to x = 0.5, the increase of σb
                      is most probably related to additional Li+ sites at the M3
                      (36f) position. The additional Li+ leads to a displacement
                      of Li+ occupying the M1 (6b) sites towards the
                      nearest-neighboring M3 position, and therefore opens the
                      fast-conducting pathway within the NASICON structure. A
                      significant change in σb was also observed as the Al3+
                      content further increased (x = 0.1 to 0.5). The highest σb
                      value of 5.63 × 10−3 S cm−1 was obtained for samples
                      with x = 0.4.},
      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},
      UT           = {WOS:000368837800043},
      doi          = {10.1039/C5TA08545D},
      url          = {https://juser.fz-juelich.de/record/810766},
}