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@ARTICLE{Friese:311025,
      author       = {Friese, Karen and Khaidukov, Nicholas and Grzechnik,
                      Andrzej},
      title        = {{T}winned ${C}s{L}n_{2}{F}_{7}$ compounds
                      ({L}n={N}d,{G}d,{T}b,{E}r,{Y}b): the role of a
                      highlysymmetrical cation lattice with an arrangement
                      analogous to the {L}avesphase ${M}g{Z}n_{2}$},
      journal      = {Zeitschrift für Kristallographie / Crystalline materials},
      volume       = {231},
      number       = {10},
      issn         = {0044-2968},
      address      = {Berlin},
      publisher    = {De Gruyter},
      reportid     = {PUBDB-2016-04574},
      pages        = {631-639},
      year         = {2016},
      note         = {(c) by Walter de Gruyter. Publisher full text in progress
                      (embargo 1 year from 28.09.2016).},
      abstract     = {The occurrence of twinning can often be related to higher
                      symmetrical structures. Fluorides are frequently twinned due
                      to their close relation to high symmetry structures like
                      fluoride, tysonite or pyrochlores. The series of compounds
                      CsLn$_2$F$_7$ is no exception. We refined the structures of
                      the twinned compounds with Ln=Nd, Gd, Tb, Er, Yb in space
                      group P112$_1$/b. An analysis of the pseudosymmetry of the
                      resulting structures shows a highly symmetrical cation
                      partial structure with a cation distribution similar to the
                      one in the hexagonal Laves phase MgZn$_2$. Several other
                      compounds ALn$_2$F$_7$, which have been described in the
                      literature, show a similar cation array. The diversity of
                      different space groups which have been reported for
                      ALn$_2$F$_7$ compounds can be better understood using
                      group-subgroup relationships assuming the hypothetical
                      structure of the cation array with space group P6$_3$/mmc as
                      aristotype. Furthermore, the twinning is easily understood
                      on the basis of the lost symmetry operations in the symmetry
                      reduction from point group 6/mmm, e.g. to 2/m in the case of
                      the CsLn$_2$F$_7$ compounds.},
      cin          = {DOOR},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)D-D3-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000386051600009},
      doi          = {10.1515/zkri-2016-1972},
      url          = {https://bib-pubdb1.desy.de/record/311025},
}