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@ARTICLE{VinodChandran:810767,
      author       = {Vinod Chandran, C. and Pristat, Sylke and Witt, Elena and
                      Tietz, Frank and Heitjans, Paul},
      title        = {{S}olid-{S}tate {NMR} {I}nvestigations on the {S}tructure
                      and {D}ynamics of the {I}onic {C}onductor {L}i $_{1+ x}$
                      {A}l $_{x}$ {T}i $_{2– x}$ ({PO} 4 ) $_{3}$ (0.0 ≤  x
                       ≤ 1.0)},
      journal      = {The journal of physical chemistry / C},
      volume       = {120},
      number       = {16},
      issn         = {1932-7447},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2016-03356},
      pages        = {8436 - 8442},
      year         = {2016},
      abstract     = {The local structure and mobility of lithium ions of the
                      NASICON-type ionic conductor Li1+xAlxTi2–x(PO4)3 (with x =
                      0.0, 0.1, 0.2, 0.35, 0.5, 0.7 and 1.0), synthesized using
                      conventional solid-state reaction route have been studied
                      with solid-state nuclear magnetic resonance (NMR)
                      techniques. 6Li, 7Li, 27Al, and 31P solid-state NMR
                      experiments have been employed to trace the structural
                      changes with varying cation concentration. The structural
                      evolution and the creation of new Al and P environments with
                      changing cation contents were studied by magic-angle
                      spinning (MAS) NMR measurements. 6Li MAS NMR and 27Al
                      triple-quantum MAS (3QMAS) show high-resolution spectra
                      enabling site assignments and phase-purity inspections. The
                      temperature dependences of 7Li NMR spin–lattice relaxation
                      (SLR) rates for different compositions yield important
                      information on the lithium ion mobility in the systems. Li
                      ion jump rates, the activation energies, and the
                      dimensionality of Li diffusion were deduced from the SLR
                      experiments. A vacancy migration model has been proposed for
                      the Li+ ionic diffusion process in pure-phase
                      Li1+xAlxTi2–x(PO4)3 prepared by solid-state reaction.
                      Above a certain threshold value of x (0.5) additional
                      phosphate phases appear that slows down diffusion. This
                      phenomenon can be observed from 6Li exchange spectroscopy.
                      The optimum cation concentration for maximum ionic mobility
                      in the phase-pure Li1+xAlxTi2–x(PO4)3 system can be read
                      directly from the solid-state NMR results.},
      cin          = {IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000375521700003},
      doi          = {10.1021/acs.jpcc.6b00318},
      url          = {https://juser.fz-juelich.de/record/810767},
}