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@ARTICLE{Ivanova:11309,
      author       = {Ivanova, M. and Ricote, S. and Meulenberg, W. A. and
                      Haugsrud, R. and Ziegner, M.},
      title        = {{E}ffects of {A}- and {B}-site (co-)acceptor doping on the
                      structure and proton conductivity of {L}a{N}b{O}4},
      journal      = {Solid state ionics},
      volume       = {213},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-11309},
      pages        = {45 - 52},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {B-site and A- and B-site co-doped lanthanum niobates,
                      La(1-x)DA(x)Nb(1-y)DB(y)O(4-delta), where D-A stands for Ca
                      or Ba and D-B for Ga, Ge or In (x = 0 or 0.01; y = 0.01),
                      have been synthesized via the solid-state route. Essentially
                      single-phase materials were obtained after 10 h at 1500
                      degrees C with monoclinic Fergusonite structure at room
                      temperature. The unit cell volume increases slightly with
                      the presence of the acceptor. The electrical conductivity of
                      the materials, characterized as a function of the
                      temperature from 300 degrees C to 900 degrees C under wet
                      reducing conditions with AC impedance spectroscopy, was
                      dominated by protons. The maximum conductivity of 4.1 .
                      10(-4) S . cm(-1) at 900 degrees C was obtained for
                      La0.99Ca0.01Nb0.99Ga0.01O4-delta, which is a factor of
                      similar to 2.5 lower than the highest conductivity reported
                      for the A-site Ca-doped LaNbO4. Based on a semi-quantitative
                      evaluation it was shown that the hydration of the B-site and
                      A- and B-site co-doped LaNbO4, is slightly more exothermic
                      and that the proton mobility has higher activation
                      enthalpies than Ca-doped LaNbO4. This is accounted for by a
                      stronger association between the acceptor and the proton for
                      B-site than for A-site doping. (c) 2011 Elsevier B.V. All
                      rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      shelfmark    = {Chemistry, Physical / Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000303636900010},
      doi          = {10.1016/j.ssi.2011.06.012},
      url          = {https://juser.fz-juelich.de/record/11309},
}