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@ARTICLE{Thalinger:279851,
      author       = {Thalinger, Ramona and Gocyla, Martin and Heggen, Marc and
                      Klötzer, Bernhard and Penner, Simon},
      title        = {{E}xsolution of {F}e and {S}r{O} {N}anorods and
                      {N}anoparticles from {L}anthanum {S}trontium {F}errite {L}a
                      $_{0.6}$ {S}r $_{0.4}$ {F}e{O} $_{3−δ}$ {M}aterials by
                      {H}ydrogen {R}eduction},
      journal      = {The journal of physical chemistry / C},
      volume       = {119},
      number       = {38},
      issn         = {1932-7455},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2015-07729},
      pages        = {22050 - 22056},
      year         = {2015},
      abstract     = {Formation of uniform Fe and SrO rods as well as
                      nanoparticles following controlled reduction of
                      La0.6Sr0.4FeO3−δ (LSF) and Ni-LSF samples in dry and
                      moist hydrogen is studied by aberration-corrected electron
                      microscopy. Metallic Fe and SrO precipitate from the
                      perovskite lattice as rods of several tenths of nm and
                      thicknesses up to 20 nm. Based on a model of Fe whisker
                      growth following reduction of pure iron oxides, Fe rod
                      exsolution from LSF proceeds via rate-limiting lattice
                      oxygen removal. This favors the formation of single iron
                      metal nuclei at the perovskite surface, subsequently growing
                      as isolated rods. The latter is only possible upon efficient
                      removal of reduction-induced water and, subsequently,
                      reduction of Fe +III/+IV to Fe(0). If water remains in the
                      system, no reduction or rod formation occurs. In contrast,
                      formation of SrO rods following reduction in dry hydrogen is
                      a catalytic process aided by Ni particles. It bears
                      significant resemblance to surface diffusion-controlled
                      carbon whisker growth on Ni, leading to similar extrusion
                      rods and filaments. In addition to SrO rod growth, the
                      exsolution of Fe nanoparticles and, subsequently, Ni–Fe
                      alloy particles is observed. The latter have also been
                      observed under static hydrogen reduction. Under strict
                      control of the experimental parameters, the presented data
                      therefore open an attractive chemically driven pathway to
                      metal nanoarchitectures beyond the formation of “simple”
                      nanoparticles.},
      cin          = {PGI-5},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000361921600033},
      doi          = {10.1021/acs.jpcc.5b06014},
      url          = {https://juser.fz-juelich.de/record/279851},
}