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@ARTICLE{Dashjav:850879,
      author       = {Dashjav, Enkhtsetseg and Ma, Qianli and Xu, Qu and Tsai,
                      Chih-Long and Giarola, Marco and Mariotto, Gino and Tietz,
                      Frank},
      title        = {{T}he influence of water on the electrical conductivity of
                      aluminum-substituted lithium titanium phosphates},
      journal      = {Solid state ionics},
      volume       = {321},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-04630},
      pages        = {83 - 90},
      year         = {2018},
      abstract     = {Li1+xAlxTi2−x(PO4)3 (0.1 ≤ x ≤ 0.6) powders
                      were prepared by a novel sol-gel method with high phase
                      purity, densification activity and conductivity. Diffraction
                      analyses showed that the solubility limit of Al3+ was
                      reached at x = 0.5. The highest ionic conductivity was
                      obtained for Li1.5Al0.5Ti1.5(PO4)3, which reached
                      1.0 × 10−3 S cm−1 at 25 °C when tested in
                      ambient air. However, measurements in dry argon resulted in
                      a conductivity of only 5 × 10−4 S cm−1 at
                      25 °C. Hence, the influence of moisture or water on
                      microstructure and grain-boundary conductivity was
                      investigated by impedance spectroscopy, scanning electron
                      microscopy, Raman spectroscopy, X-ray and neutron
                      diffraction. An ion exchange of Li+ by protons could not be
                      unambiguously achieved by exposure of LATP powder in water.
                      Neutron diffraction of humidified samples did not clearly
                      indicate the presence of water or protons in the crystal
                      structure of LATP, whereas μ-Raman measurements confirmed
                      the presence of water/protons on the sample surface and in
                      the bulk material. A higher signal of the vibrational modes
                      of H2O was measured on grain boundaries than in the grain
                      interior on the sample surface as well as on the fractured
                      surface of sintered specimens. Therefore the higher apparent
                      conductivity of LATP samples may predominantly result from
                      adsorbed water from ambient air at grain boundaries. Hence,
                      the conductivity tested in dry argon represents the correct
                      conductivity of LATP samples. The highest density after
                      sintering is not necessarily leading to high conductivity
                      but rather the microstructure plays the dominant role.},
      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) / SOFC - Solid
                      Oxide Fuel Cell (SOFC-20140602)},
      pid          = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)SOFC-20140602},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000437372200013},
      doi          = {10.1016/j.ssi.2018.04.010},
      url          = {https://juser.fz-juelich.de/record/850879},
}