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@ARTICLE{Sohn:190044,
      author       = {Sohn, Y. J. and Sparta, K. M. and Meven, M. and Roth, G.
                      and Heger, G.},
      title        = {{S}uperprotonic conductivity of
                      ({NH}$_{4}$)$_{3}${H}({SO}$_{4}$)$_{2}$ in the
                      high-temperature phase},
      journal      = {Solid state ionics},
      volume       = {252},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2015-03003},
      pages        = {116 - 120},
      year         = {2013},
      abstract     = {Impedance measurements were performed on single crystals of
                      (NH4)3H(SO4)2 in the temperature range of 295–441 K.
                      Anisotropy of protonic conductivity was found in the
                      monoclinic room-temperature phase (space group C2/c) as well
                      as in the rhombohedral high-temperature phase (space group R
                      3 ¯ m ). Above the high-temperature phase transition at 413
                      K, conductivity in the hexagonal (001) plane yields a value
                      of ~ 10− 2 S cm− 1, which is typical for superionic
                      conductors. A verification of a sample quality after the
                      impedance measurements, using X-ray powder diffraction,
                      showed minor additional peaks of (NH4)2(SO4). This suggests
                      a beginning of thermal decomposition at high temperature.
                      The possible pathways of proton conduction were discussed
                      according to crystal structure analyses by single-crystal
                      neutron diffraction method.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2 / IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)IEK-1-20101013},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000328239600018},
      doi          = {10.1016/j.ssi.2013.06.011},
      url          = {https://juser.fz-juelich.de/record/190044},
}