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@ARTICLE{Song:904008,
      author       = {Song, Jia and Zhu, Shaochen and Ning, De and Bouwmeester,
                      Henny},
      title        = {{D}efect chemistry and transport properties of
                      perovskite-type oxides {L}a 1−x {C}a x {F}e{O} 3−δ},
      journal      = {Journal of materials chemistry / A},
      volume       = {9},
      number       = {2},
      issn         = {2050-7488},
      address      = {London ˜[u.a.]œ},
      publisher    = {RSC},
      reportid     = {FZJ-2021-05578},
      pages        = {974 - 989},
      year         = {2021},
      abstract     = {Structural evolution, electrical conductivity, oxygen
                      nonstoichiometry and oxygen transport properties of
                      perovskite-type oxides La1−xCaxFeO3−δ (x = 0.05, 0.10,
                      0.15, 0.20, 0.30 and 0.40) are investigated. All
                      investigated compositions exhibit, under ambient air, a
                      phase transition from room-temperature orthorhombic (space
                      group Pbnm) to rhombohedral (space group R[3 with combining
                      macron]c) at elevated temperature. The transition
                      temperature is found to decrease gradually from 900 °C for
                      x = 0.05 to 625 °C for x = 0.40. Analysis of the data of
                      oxygen nonstoichiometry obtained by thermogravimetry shows
                      that under the given experimental conditions the Ca dopant
                      is predominantly compensated by formation of electron holes
                      rather than by oxygen vacancies. Maximum electrical
                      conductivity under air is found for the composition with x =
                      0.30 (123 S cm−1 at 650 °C). Analysis of the temperature
                      dependence of the mobility of the electron holes in terms of
                      Emin–Holstein's theory indicates that small polaron theory
                      fails for the compositions with high Ca contents x = 0.30
                      and x = 0.40. This is tentatively explained by the increased
                      delocalization of charge carriers with increasing Ca dopant
                      concentration. The oxygen transport properties of
                      La1−xCaxFeO3−δ in the range 650–900 °C are evaluated
                      using the electrical conductivity relaxation (ECR)
                      technique. Combined with data of oxygen non-stoichiometry,
                      the obtained results enable calculation of the oxygen
                      vacancy diffusion coefficient and associated ionic
                      conductivity. Both parameters increase with increasing Ca
                      content in La1−xCaxFeO3−δ, while it is found that the
                      effective migration barrier for oxygen diffusion decreases
                      with decreasing oxygen vacancy formation enthalpy.},
      cin          = {IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1232 - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000609149500021},
      doi          = {10.1039/D0TA07508F},
      url          = {https://juser.fz-juelich.de/record/904008},
}