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@ARTICLE{Ebbinghaus:168894,
      author       = {Ebbinghaus, Stefan G. and Krause, Holger and Lee, Doh-Kwon
                      and Janek, Jürgen},
      title        = {{S}ingle {C}rystals of {C}12{A}7
                      $\mathrm{({C}a_{12}{A}l_{14}{O}_{33})}$ {S}ubstituted with 1
                      mol \% {I}ron},
      journal      = {Crystal growth $\&$ design},
      volume       = {14},
      number       = {5},
      issn         = {1528-7505},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {DESY-2014-02712},
      pages        = {2240 - 2245},
      year         = {2014},
      abstract     = {Single crystals of Ca12Al14O33 (C12A7, mayenite)
                      substituted with 1 mol $\%$ Fe were grown by the floating
                      zone technique in an atmosphere of $2\%$ $O2/98\%$ N2. The
                      iron substitution leads to an increase of the unit cell
                      parameter by roughly 0.002 Å. Optical spectroscopy reveals
                      an additional broad absorption band at 310 nm for the
                      iron-substituted sample reflecting the yellow color of the
                      crystals. XANES measurements at the Fe–K absorption edge
                      prove the incorporation of Fe3+ on the aluminum sites.
                      Measurements of the magnetic susceptibility resulted in a
                      value of 5.8 μB per iron ion as expected for high-spin
                      Fe3+. C12A7 is known to be a very good oxygen ion conductor
                      at high temperatures. In pure oxygen, the iron substitution
                      leads to a slightly reduced conductivity between
                      approximately 500 and 800 °C, while at higher temperatures,
                      the conductivity is very similar to the pristine material.
                      Under reducing conditions, the slope of log(σ) vs
                      log(p(O2)) of the iron-substituted sample was found to be
                      steeper than that for pure C12A7.},
      cin          = {DOOR},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {DORIS Beamline A1 (POF2-54G13) / FS-Proposal: I-20110471
                      (I-20110471)},
      pid          = {G:(DE-H253)POF2-A1-20130405 / G:(DE-H253)I-20110471},
      experiment   = {EXP:(DE-H253)D-A1-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000335879500024},
      doi          = {10.1021/cg401823k},
      url          = {https://bib-pubdb1.desy.de/record/168894},
}