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@ARTICLE{Pithan:909807,
      author       = {Pithan, C. and Iida, Y. and Dornseiffer, J. and Tsubouchi,
                      A. and Waser, R.},
      title        = {{O}xygen nonstoichiometry and electrical transport
                      properties of {P}r1-{C}a {M}n{O}3 ceramics},
      journal      = {Journal of the European Ceramic Society},
      volume       = {42},
      number       = {15},
      issn         = {0955-2219},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2022-03428},
      pages        = {7049 - 7062},
      year         = {2022},
      abstract     = {The defect chemistry of solid solutions formed by the two
                      orthorhombic perovskite-type compounds CaMnO3 and PrMnO3 is
                      strongly determined by mixed valence states emerging from
                      the presence of trivalent or tetravalent Mn-cations, Mn3+
                      and Mn4+. Both, thermogravimetric analysis as well as
                      measurements of DC-conductivity at elevated temperatures in
                      dependence of the partial pressure of oxygen quantitatively
                      reveal the extent of oxygen vacancy formation in highly
                      densified ceramic pellets originally consolidated by
                      sintering in pure oxygen O2. Iodometry additionally serves
                      to analyse the average valence state of Mn-cations and thus
                      of the deficiency in oxygen after targeted thermal
                      treatments under specific redox conditions. The
                      determination of electrical transport properties including
                      also the careful inspection of the Seebeck-effect for such
                      specimens demonstrates that the mobility of electrons is
                      drastically reduced when the number of oxygen vacancies
                      increases. For the specific composition Pr0.7Ca0.3MnO3, an
                      oxide potentially relevant for resistively switching memory
                      device applications, this is the case when the deficiency in
                      oxygen exceeds a concentration of 1000 ppm. Detailed
                      crystallographic studies based on refined
                      neutron-diffraction experiments for reduced ceramic material
                      suggest, that the reduction in electron transfer rates
                      between tri- and tetravalent cations of manganese originates
                      from an anisotropy effect: In the case of comparatively
                      large oxygen deficiency, vacancies preferentially form on
                      lattice sites in the equatorial plane of MnO6-octahedra
                      rather than on their apices.},
      cin          = {PGI-7 / PGI-10 / JARA-FIT},
      ddc          = {660},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / I:(DE-Juel1)PGI-10-20170113 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {5233 - Memristive Materials and Devices (POF4-523)},
      pid          = {G:(DE-HGF)POF4-5233},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000886093300004},
      doi          = {10.1016/j.jeurceramsoc.2022.08.006},
      url          = {https://juser.fz-juelich.de/record/909807},
}