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@ARTICLE{Ivanova:255478,
      author       = {Ivanova, Mariya and Meulenberg, Wilhelm A. and Palisaitis,
                      Justinas and Sebold, Doris and Solís, Cecilia and Ziegner,
                      Mirko and Serra, Jose M. and Mayer, Joachim and Hänsel,
                      Michael and Guillon, Olivier},
      title        = {{F}unctional properties of
                      {L}a$_{0.99}${X}$_{0.01}${N}b$_{0.99}${A}l$_{0.01}${O}$_{4−δ}$
                      and
                      {L}a$_{0.99}${X}$_{0.01}${N}b$_{0.99}${T}i$_{0.01}${O}$_{4−δ}$
                      proton conductors where {X} is an alkaline earth cation},
      journal      = {Journal of the European Ceramic Society},
      volume       = {35},
      number       = {4},
      issn         = {0955-2219},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2015-05640},
      pages        = {1239 - 1253},
      year         = {2015},
      abstract     = {Lanthanum niobates with general formulas of
                      La0.99X0.01Nb0.99Al0.01O4−δ and
                      La0.99X0.01Nb0.99Ti0.01O4−δ (X = Mg, Ca, Sr or Ba) were
                      synthesized via the conventional solid state reaction.
                      Specimens with relative density above $96\%$ were produced
                      after sintering. Structural and phase composition studies
                      revealed predominant monoclinic Fergusonite structure for
                      the majority of samples. SEM and TEM studies elucidated the
                      effect of the used dopant combinations on grain growth,
                      micro-crack formation and secondary phase formation. Results
                      from microstructural study were correlated to the grain
                      interior and grain boundary conductivities for selected
                      samples (La0.99Sr0.01Nb0.99Al0.01O4−δ and
                      La0.99Sr0.01Nb0.99Ti0.01O4−δ). The majority of co-doped
                      niobates exhibited appreciable protonic conductivity under
                      humid atmospheres at intermediate temperatures. Sr- or
                      Ca-doped compounds displayed the highest total
                      conductivities with values for LSNA equal to 6 × 10−4
                      S/cm and 3 × 10−4 S/cm in wet air and in wet $4\%$
                      H2–Ar (900 °C), respectively. Additionally, thermal
                      expansion was studied to complete functional
                      characterization of co-doped LaNbO4.},
      cin          = {IEK-1 / JARA-ENERGY},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000348084300012},
      doi          = {10.1016/j.jeurceramsoc.2014.11.009},
      url          = {https://juser.fz-juelich.de/record/255478},
}