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@ARTICLE{Creutzburg:473575,
      author       = {Creutzburg, Marcus and Kellschopp, Kai and Gleissner,
                      Robert and Arndt, Bjoern and Vonbun-Feldbauer, Gregor and
                      Vonk, Vedran and Noei, Heshmat and Stierle, Andreas},
      title        = {{S}urface {S}tructure of {M}agnetite (111) under
                      {O}xidizing and {R}educing {C}onditions},
      journal      = {Journal of physics / Condensed matter},
      volume       = {34},
      number       = {16},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2022-00129},
      pages        = {164003},
      year         = {2022},
      abstract     = {We report on differences in the magnetite (111) surface
                      structure when prepared under oxidizing and reducing
                      conditions. Both preparations were done under UHV conditions
                      at elevated temperatures, but in one case the sample was
                      cooled down while keeping it in an oxygen atmosphere.
                      Scanning tunneling microscopy after each of the preparations
                      showed a different apparent morphology, which is discussed
                      to be an electronic effect and which is reflected in the
                      necessity of using opposite bias tunneling voltages in order
                      to obtain good images. Surface x-ray diffraction revealed
                      that both preparations lead to Fe vacancies, leading to
                      local O-terminations, the relative fraction of which
                      depending on the preparation. The preparation under reducing
                      conditions lead to a larger fraction of Fe-termination. The
                      geometric structure of the two different terminations was
                      found to be identical for both treatments, even though the
                      surface and near-surface regions exhibit small compositional
                      differences; after the oxidizing treatment they are iron
                      deficient. Further evidence for the dependence of iron vs
                      oxygen fractional surface terminations on preparation
                      conditions comes from Fourier transform infrared
                      reflection-absorption spectroscopy, which is used to study
                      the adsorption of formic acid. These molecules dissociate
                      and adsorb in chelating and bidentate bridging geometries on
                      the Fe-terminated areas and the signal of typical infrared
                      absorption bands is stronger after the preparation under
                      reducing conditions, which results in a higher fraction of
                      Fe-termination. The adsorption of formic acid induced an
                      atomic roughening of the magnetite (111) surface which we
                      conclude from the quantitative analysis of the crystal
                      truncation rod data. The roughening process is initiated by
                      atomic hydrogen, which results from the dissociation of
                      formic acid after its adsorption on the surface. Atomic
                      hydrogen adsorbs at surface oxygen and after recombination
                      with another H this surface hydroxyl can form H2O, which may
                      desorb from the surface, while iron ions diffuse into
                      interstitial sites in the bulk.},
      cin          = {FS-NL},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-NL-20120731},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / SFB 986 A07 - Adsorption organischer
                      Säuren auf Oxidoberflächen und Nanostrukturen (A07)
                      (318017425) / SFB 986 A04 - Ab-initio basierte Modellierung
                      der elektronischen und mechanischen Eigenschaften von
                      Hybrid-Grenzflächen (A04) (221132808)},
      pid          = {G:(DE-HGF)POF4-632 / G:(GEPRIS)318017425 /
                      G:(GEPRIS)221132808},
      experiment   = {EXP:(DE-H253)Nanolab-01-20150101 /
                      EXP:(DE-H253)Nanolab-02-20150101 /
                      EXP:(DE-H253)Nanolab-04-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:35051906},
      UT           = {WOS:000759141700001},
      doi          = {10.1088/1361-648X/ac4d5a},
      url          = {https://bib-pubdb1.desy.de/record/473575},
}