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@ARTICLE{Heuer:891166,
      author       = {Heuer, Sabrina A. and Schierholz, Roland and Alekseev,
                      Evgeny and Peters, Lars and Mueller, David N. and Duchoň,
                      Tomáš and Vibhu, Vaibhav and Tempel, Hermann and de Haart,
                      L.G.J. and Kungl, Hans and Eichel, Rüdiger-A.},
      title        = {{O}xygen {N}onstoichiometry and {V}alence {S}tate of
                      {M}anganese in {L}a 1– x {C}a x {M}n{O} 3+δ},
      journal      = {ACS omega},
      volume       = {6},
      number       = {14},
      issn         = {2470-1343},
      address      = {Washington, DC},
      publisher    = {ACS Publications},
      reportid     = {FZJ-2021-01404},
      pages        = {9638 - 9652},
      year         = {2021},
      abstract     = {Perovskites of the ABO3 type, such as LaMnO3, can be used
                      as air electrodes in solid oxide fuel cells and
                      electrolyzers. Their properties can be tuned by A- and
                      B-site substitutions. The influence of La substitution by Ca
                      on the oxygen nonstoichiometry has been investigated
                      frequently, but the results depend highly on the synthesis
                      and atmospheric conditions. In this work, a series of
                      La1–xCaxMnO3+δ (x = 0–0.5) was synthesized using
                      conventional solid-state synthesis under an air atmosphere.
                      The structures of the materials were studied in detail with
                      powder X-ray diffraction. The initial oxygen
                      nonstoichiometries were determined using thermogravimetric
                      reduction. The samples were subsequently analyzed in terms
                      of defect chemistry in dependence of temperature,
                      atmosphere, and Ca content via thermogravimetric analysis.
                      The changes in the manganese charge states were investigated
                      by X-ray absorption near-edge spectroscopy experiments. The
                      influence of intrinsic and extrinsic effects on the
                      Mn-valence state of the differently Ca-substituted samples
                      as calculated from thermogravimetric analysis and as
                      determined directly from X-ray absorption near-edge
                      spectroscopy is presented.},
      cin          = {IEK-9 / PGI-6},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-9-20110218 / I:(DE-Juel1)PGI-6-20110106},
      pnm          = {122 - Elektrochemische Energiespeicherung (POF4-122) / 1232
                      - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-122 / G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33869944},
      UT           = {WOS:000640649500033},
      doi          = {10.1021/acsomega.1c00208},
      url          = {https://juser.fz-juelich.de/record/891166},
}