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@ARTICLE{Samain:189316,
      author       = {Samain, Louise and Amshoff, Philipp and Biendicho, Jordi J.
                      and Tietz, Frank and Mahmoud, Abdelfattah and Istomin,
                      Sergey Ya. and Grins, Jekabs and Svensson, Gunnar and
                      Hermann, Raphael},
      title        = {{C}rystal structure and high-temperature properties of the
                      {R}uddlesden–{P}opper phases {S}r$_{3−x}${Y}$_{x}$({F}e
                      $_{1.25}$ {N}i$_{0.75}$){O}$_{7−δ}$ (0≤x≤0.75)},
      journal      = {Journal of solid state chemistry},
      volume       = {227},
      issn         = {0022-4596},
      address      = {Orlando, Fla.},
      publisher    = {Academic Press},
      reportid     = {FZJ-2015-02494},
      pages        = {45 - 54},
      year         = {2015},
      abstract     = {Ruddlesden–Popper n=2 member phases
                      Sr3−xYxFe1.25Ni0.75O7−δ, 0≤x≤0.75, have been
                      investigated by X-ray and neutron powder diffraction,
                      thermogravimetry and Mössbauer spectroscopy. Both samples
                      as-prepared at 1300 °C under N2(g) flow and samples
                      subsequently air-annealed at 900 °C were studied. The
                      as-prepared x=0.75 phase is highly oxygen deficient with
                      δ=1, the O1 atom site being vacant, and the Fe3+/Ni2+ ions
                      having a square pyramidal coordination. For as-prepared
                      phases with lower x values, the Mössbauer spectral data are
                      in good agreement with the presence of both 5- and
                      4-coordinated Fe3+ ions, implying in addition a partial
                      occupancy of the O3 atom sites that form the basal plane of
                      the square pyramid. The air-annealed x=0.75 sample has a δ
                      value of 0.61(1) and the structure has Fe/Ni ions in both
                      square pyramids and octahedra. Mössbauer spectroscopy shows
                      the phase to contain only Fe3+, implying that all Ni is
                      present as Ni3+. Air-annealed phases with lower x values are
                      found to contain both Fe3+ and Fe4+. For both the
                      as-prepared and the air-annealed samples, the Y3+ cations
                      are found to be mainly located in the perovskite block. The
                      high-temperature thermal expansion of as-prepared and
                      air-annealed x=0.75 phases were investigated by
                      high-temperature X-ray diffraction and dilatometry and the
                      linear thermal expansion coefficient determined to be 14.4
                      ppm K−1. Electrical conductivity measurements showed that
                      the air-annealed samples have higher conductivity than the
                      as-prepared ones.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)IEK-1-20101013},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6213 - Materials
                      and Processes for Energy and Transport Technologies
                      (POF3-621) / 6G4 - Jülich Centre for Neutron Research
                      (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6213 / G:(DE-HGF)POF3-6G4},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000355639500008},
      doi          = {10.1016/j.jssc.2015.03.018},
      url          = {https://juser.fz-juelich.de/record/189316},
}