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@ARTICLE{Jin:887925,
      author       = {Jin, Lei and Koulialias, D. and Schnedler, Michael and
                      Gehring, Markus and Posfai, M. and Ebert, Philipp and
                      Charilaou, M. and Schaueblin, R. E. and Jia, Chun-Lin and
                      Loeffler, J. F. and Dunin-Borkowski, Rafal},
      title        = {{A}tomic-scale {C}haracterization of {C}ommensurate and
                      {I}ncommensurate {V}acancy {S}uperstructures in {N}atural
                      {P}yrrhotites},
      journal      = {American mineralogist},
      volume       = {106},
      number       = {1},
      issn         = {1945-3027},
      address      = {Alexandria, Va.},
      publisher    = {GeoScienceWorld},
      reportid     = {FZJ-2020-04517},
      pages        = {82–96},
      year         = {2021},
      abstract     = {Pyrrhotites, characterized by the chemical formula
                      Fe1–δS (0 < δ ≤ 1/8), represent an extended group of
                      minerals that are derived from the NiAs-type FeS aristotype.
                      They contain layered arrangements of ordered Fe vacancies,
                      which are at the origin of the various magnetic signals
                      registered from certain natural rocks and can act as
                      efficient electrocatalysts in oxygen evolution reactions in
                      ultrathin form. Despite extensive studies over the past
                      century, the local structural details of pyrrhotite
                      superstructures formed by different arrangements of Fe
                      vacancies remain unclear, in particular at the atomic scale.
                      Here, atomic-resolution high-angle annular dark-field
                      imaging and nanobeam electron diffraction in the scanning
                      transmission electron microscope are used to study natural
                      pyrrhotite samples that contain commensurate 4C and
                      incommensurate 4.91 ± 0.02C constituents. Local
                      measurements of both the intensities and the picometer-scale
                      shifts of individual Fe atomic columns are shown to be
                      consistent with a model for the structure of 4C pyrrhotite,
                      which was derived using X-ray diffraction by Tokonami et al.
                      (1972). In 4.91 ± 0.02C pyrrhotite, 5C-like unequally sized
                      nano-regions are found to join at anti-phase-like
                      boundaries, leading to the incommensurability observed in
                      the present pyrrhotite sample. This conclusion is supported
                      by computer simulations. The local magnetic properties of
                      each phase are inferred from the measurements. A discussion
                      of perspectives for the quantitative counting of Fe
                      vacancies at the atomic scale is presented.},
      cin          = {ER-C-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {5351 - Platform for Correlative, In Situ and Operando
                      Characterization (POF4-535) / 3D MAGiC - Three-dimensional
                      magnetization textures: Discovery and control on the
                      nanoscale (856538) / ESTEEM3 - Enabling Science and
                      Technology through European Electron Microscopy (823717) /
                      DARPA, Phase 2 - Defense Advanced Research Projects Agency
                      Manipulation of magnetic skyrmions for logicin- memory
                      applications (Z1422.01.18)},
      pid          = {G:(DE-HGF)POF4-5351 / G:(EU-Grant)856538 /
                      G:(EU-Grant)823717 / G:(DE-Juel-1)Z1422.01.18},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000604401600009},
      doi          = {10.2138/am-2020-7479ccby},
      url          = {https://juser.fz-juelich.de/record/887925},
}